Malicious PDF — malware analysis report

Static analysis result for SHA-256 075ec13a57d5d1c6…

MALICIOUS

PDF

78.6 KB Created: 2021-09-06 02:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3b600b305333243d403fc44621241323 SHA-1: 5fcc198a8f84c91c2ae7607bd15e063f06a4c0c5 SHA-256: 075ec13a57d5d1c66974392086ad6ab1e0c9da136c6b70bf4e3fea6077132cb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as a lure to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb8a77a47---rekipi.pdf In PDF document text
    • http://dansungsala.com/uploads/files/koverovexugelojul.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/85865168905.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/96364111392.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/58999906127.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/57742675418.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc629a03d94---28810010400.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e4ddbcbb330fc67bf360fd55a1e4448e/mejujufor.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/nuvivukimusokikepimutuzuf.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/pedadaloso.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8a86c8ce8---17680616646.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160866f812ffd3---wurejabadirexufinomazedu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93c8265f67---kidawapukapobobanoranuser.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121aaa5b85c9---57906471621.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/23101701542.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/ee5f60fb00a6652c8040e00133956778/64790972514.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/38012018785.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/nmqo2g0ko65hgttrrmu87josbr/bomuvodunifafasude.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/pelajusixe.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/6fe57d216274aa2309d4d4196f4cad76/79242220606.pdfIn PDF document text
    • https://hojoairport.com/images/file/govupejoduwemotekijen.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/wopiniwivexinaji.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5878602786.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/62427498278.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/rbtonhl6e6e98s7anlr1u8j950/nurozilabiduwowe.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16086d478afd81---34923106238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=btunes+wireless+bluetooth+adapter+manualPDF 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_off0000cbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD7 11036 bytes
SHA-256: 98659640ddf42b9c5a1489ae9ca94f0979f540fbfea7abf99b7b2f98577c00ee
font_01_sfnt_off0000e52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52C 17968 bytes
SHA-256: 3604a7c0d1b1652b6fee69e1581eb42bf0fb638df3bcde813849d8a6031f31f5
font_02_sfnt_off00011408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1