Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d20775a799accf…

MALICIOUS

PDF

68.9 KB Created: 2021-09-29 06:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b1cf53c087f89aedd52a68619ecc5e67 SHA-1: ef7291f76126cd63274d656b6df16ff91f3b86b8 SHA-256: c2d20775a799accfa8cec70b8ecfa5c22e0dc8e86b8df1feea1203d8db97afcd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://crewmak.ru/uplcv?utm_term=j4+plus+screen+size PDF link annotation
    • http://esoftland.com/userfiles/file/dafejipajowanikuponi.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/gamikedisetigupewipotamu.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/92285292128.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/korarasufufab.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/borinunofakikepiwigudur.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/dipuzem.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/manoxofumajaxoziwiruvuf.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ce9de3ff6---monewapawotupaba.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/fogunemokak.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/9118927169.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/39111783045.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7f75a5901---zifinisezenerujupave.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/zuwosas.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/39412156946.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/xigovezeliz.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/dezajeguvedupowisepir.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/59538912605.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/xorukinosefidowunarilag.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/viruwemarafumejepemid.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140a4e3b925b---18893892280.pdfIn PDF document text
    • https://riwg.in/userfiles/file/19582920857.pdfIn PDF document text
    • http://citra.cl/userfiles/file/32582937690.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/kufejalifixutilililor.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/30520588887.pdfIn PDF document text
    • http://elezioni2014.gds.it/userfiles/file/salazadutususezobof.pdfIn PDF document text
    • 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_off0000b2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F0 14164 bytes
SHA-256: 0398234bd4c9a6fbc70f310d4eb77ab86e708797445c79878083a96e30c34743
font_01_sfnt_off0000d68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 10216 bytes
SHA-256: 3e1cfeb5ddfaf0527feddac0c8af3c4dd42a9a4b221ed9540eae1c070adf0d4d

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