Malicious PDF — malware analysis report

Static analysis result for SHA-256 382e2436fc68ab13…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 08:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 13e41f3b8fcc3fba91bd2da28399d24a SHA-1: 25455eab7a80222abe641486b539995f35c9ab2d SHA-256: 382e2436fc68ab1385a1546bdd7af584522c8ae7eebbea78f53ba3c0136cb1fa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or malware distribution lure, indicated by numerous heuristic firings related to compromised CMS uploads and link farms. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs point to various compromised WordPress sites, likely serving as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/080ca3c9e438aa2519337e8390a5bca8/96535848297.pdf In PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608212375b20f---jirelite.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/71682225324.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee43c48856---vulizoborinotokisexe.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/95998509774.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1610db0017420a---pitavavebogapiwudovobone.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/zigebebewosikugitidewidi.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd4e63a611---65527760037.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/10907022557.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/nexoruvewevitituzotet.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a99db04d54---kozupasivadefiwexudomud.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/11948058815.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/bagise.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/nujutuvobalufegixagolir.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f33693532---kakogogupaxosenijelu.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/85178476515.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9be80abab3---futovonuluwig.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/2vh5spk0pei74i9p6ieiplvn8a/buwuzixopumemukevunabaxuj.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/d2ac17d6b9d471d46b7f4e2ccc7b7d14/duvupodevig.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/60750223038.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/24016160356.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca1b3a0528---nanifadewixupi.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/vizudomuvunan.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc71cd5c16---44194024329.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/smfbq94eko9i8a25rehn8tkb01/94496862611.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/labopopuvabasapajugek.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/f91476186030404032e0ee6773503992/89144108802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=superheated+steam+properties+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C3 10788 bytes
SHA-256: 6a69f140eaec0b64c317ac8f9b53ba283a5118e432dbcc865ac7af36479cefd0
font_01_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 17316 bytes
SHA-256: c284e2eedbd864354456cd56c6beddea7a7a096af26b73bfa297e7340108d880
font_02_sfnt_off00012a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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