Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e794bef03688707…

MALICIOUS

PDF

86.7 KB Created: 2021-09-03 00:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f9fea3842c108361c28d3c47ba964560 SHA-1: d743edd1f958991367db68af5e5b38cb8b5771f7 SHA-256: 3e794bef036887075ad8d2e1679de45e6b84a6268541b3fc41d93949a37df9a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://aronabritcan.com/userfiles/file/nodabevali.pdf In PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/perisez.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1e1e3bb0d---vijuruwemis.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/bb6ae4af3f341a2d99119da5e623b8d3/38872689888.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/1802fbd76f00d2021af41ba74b3f49dd/42003351838.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/1hbdvaq723cjl6v282pln09ght/molosupimokorusejuvasas.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/99513440232.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/82841225406.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161234429d59c0---xugaxejovaxaxolapumo.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/tejoxafifawogamu.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/tunerifogotakejudukitus.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/vc4ndms39rntf5hqgk0h4fei41/xotogunolibuwererigapu.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/59400531964.pdfIn PDF document text
    • https://emmaushuis.org/pages/71180455637.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/lugewotuvoxize.pdfIn PDF document text
    • https://hurtowniaroza.pl/upload/files/997940200.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/a22f872c4ccef243e0c7e1735206f536/varojewowebojug.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/44ipa5ov8vp8c4peq6eokgigo5/55163307417.pdfIn PDF document text
    • http://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/52542261837.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/sonoferalujupepok.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/7263152741.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0de264740---bagepenovukixinetunuf.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/buxarubuxuwafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=master+pdf+editor+ubuntu+debPDF 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_off0000eb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8A 10680 bytes
SHA-256: fcf08484ab29b4a38102ec2a2164624ad62b748477893517a7b53885435112f9
font_01_sfnt_off000103ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EA 18628 bytes
SHA-256: a94b43e95a63bfcf3f49a51f376cac422fab47975c5cad4d0c16389320b82412
font_02_sfnt_off00013532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1