Malicious PDF — malware analysis report

Static analysis result for SHA-256 876c78ed5dc8dd5b…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 15:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6b5cb8ae49a861f4eb71951172cc87b7 SHA-1: 64a068963e158b5812dd5967ca97a7197f47f062 SHA-256: 876c78ed5dc8dd5b438013cf93f0d281718f49d1a538eb1ad4664c30a131cdf8
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to potentially harmful sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=dune+pdf+book PDF link annotation
    • http://falconfam.com/ckfinder/userfiles/files/34463569189.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/waxinudupa.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210918_3EC79FB4C52E9905.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/47703016282.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gisobivuz.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/berosaxolasedona.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/xelakazuzofumopix.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16145800115824---bidusosi.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/fedetenenamoxix.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/naperefujepofosenigume.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/88723790938.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/18462288636.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/gexode.pdfIn PDF document text
    • https://dhesient.com/media/48332089171.pdfIn PDF document text
    • http://vpsystem.com/files/fck/54421325142.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/sexukirizow.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/56955669596.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/xunumejetejunoz.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/68901716599.pdfIn PDF document text
    • http://szcftz.com/upload/lijovi.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d58235727---82051496276.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109220657187053.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210911_8199E981CF66B671.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161477d2c1ac3f---42959265501.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_off0000b291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB291 10160 bytes
SHA-256: 614c427c8bd7a6bfb9a35cc563864e0636458f1f6511c219e17e7e58049064a4
font_01_sfnt_off0000c926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC926 14928 bytes
SHA-256: bac49c8c10e99061ff7120f9899db203f9330691172b7dcce427c9ee81290c6a
font_02_sfnt_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1