Malicious PDF — malware analysis report

Static analysis result for SHA-256 212da973a1284b50…

MALICIOUS

PDF

80.6 KB Created: 2021-07-03 19:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d1df837082af67b26086e85ca60cf92 SHA-1: e3c33281d58d5d343eb545bb57e6e2cf98e993a6 SHA-256: 212da973a1284b50a9c3c5531f546e20f957f100ae3e28507166f241403c341a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pet-fashion.ro/mm/file/59599581385.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606d15093b330---jupoluvisimoweduwab.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/fqcl9n0605ntf3st8kkhdis6nm/bikilafowufiradivomuwukar.pdf
    • https://bamfieldrental.com/userfiles/file/73344953693.pdf
    • http://delannahotel.com/user_img/file/finudesuke.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/3afa4b43c520e28bf4cbdfdbbe178aff/xupaxudejijemabaki.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24a53215ef---kogukizisegotudifogajifer.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/3fb04ac6199a34ef108415d6bcd956d0/savirugaze.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/87476b9bec32c5657967c38e99568f35/42435138312.pdf
    • https://globalmediaminds.com/uploads/files/rojidatakuvewo.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6f74ad07a444bf83e9852f0e15911fae/15788483906.pdf
    • https://walkandsmile.com/userfiles/file/47744858445.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/1bogvd1r2a15f3vuefj92eo8mg/figajopenudetusaw.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/pttj499r80bokb89kj03h8btb3/44501491979.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/187397469a7392998a4a23797d508630/99297298653.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/09b6a109d0177b4d07a470053c7686c3/82149898342.pdf
    • http://laros.cz/UserFiles/file/8938390842.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/oosuhlopkhn28os2j4i7o1057q/22202329257.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de61188e12f---88209777161.pdf
    • https://arerp.kr/data/file///somediputeluzewopawelapo.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/cqnqsj7tl7f60leldm85baco53/88736511439.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160774911c49dd---81481313061.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/c7118f946d5852dd9e3ed8899f8439de/1751691670.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=y+to+y+meaning+dictionary
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8fa.bin
59f3c009488c8d6b3d5bfc701a21ab9bf3c430804d4d453dfec2533be6e69527
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FA 10596 bytes
font_01_sfnt_off0000f0ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 16792 bytes
font_02_sfnt_off00010901.bin
1426d6417427c9d38afcdbbc71f213ddb504b6f544d6bff2482f866b7d1edd37
pdf-font-stream PDF embedded font (sfnt) at offset 0x10901 17172 bytes