Malicious PDF — malware analysis report

Static analysis result for SHA-256 a197d8af41845f51…

MALICIOUS

PDF

90.8 KB Created: 2021-07-27 17:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9233aec5cacc9012b6c750cb0eb085fb SHA-1: 3380affc068bd8ef23f772c379f4cbbf0cd34f38 SHA-256: a197d8af41845f5176a9246dcc07dde41d2a818b2c223dc2d19e5549483979cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, further increasing suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a758593f539---61959232444.pdf In PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879b0807d8b---20244305663.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/939b36b075129d841124a573fb21defa/78230687223.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/xikobasifoxe.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/87670270764.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c07f46f2af0---33150322627.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c45d897c1c5---8357249238.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/tqfk6ek611mfvd19356aqg9633/lelirumexunapezenaxet.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/k3opm451du7reaosu0a2s4ir1h/vinejipo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7844a7091299c8fff0f0af198f50f513/90874884602.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/mapumepuwanex.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/81684509674.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98c08137f1---90182693719.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/58190700729.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/87cca429675f7aa865d37a3fa6fdccaa/wagidalubomilisufejiwaf.pdfIn PDF document text
    • https://tpk-m.ru/files/file/golexexogegobe.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092add352904---5179802468.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/svrb2fum1rnssov9ed0edlg015/24567374828.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/40822564850.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c6e0df9a3---fedixolizijogobuweturima.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/67131568787.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ueasoob4te3d1mc4uvan49ao1j/tajimipujuxomuxadi.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/xifaxufenokofezilonejag.pdfIn PDF document text
    • https://goodline.by/userfiles/file/96653962308.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/kebejuziriva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+get+charter+email+on+android+phonePDF 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_off0000fc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC73 17748 bytes
SHA-256: b30a7403530cc7c4958f0995b72be5d33e44d4599c34bd055057110918f91b52
font_01_sfnt_off00012b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001432e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432E 10872 bytes
SHA-256: 82eec54a543e29f8d7e13814385e0492a68c78309c81192a8d3efd7ad9963641