Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b024694a1630e01…

MALICIOUS

PDF

75.0 KB Created: 2021-08-21 11:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ed3eecfd1f72d57bb5012201f005000 SHA-1: 87a4025dc70fefd6d9cce359611e0679c1a1d1c4 SHA-256: 1b024694a1630e01d893430796ed29d527f8e9165b959e56b7de9c4f8c5cfc36
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Some of these links point to compromised WordPress upload directories, suggesting an attempt to distribute or host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.awakohchang.com/image/upload/File/ibifowijijewetijigariva.pdf
    • http://murito.fr/ckfinder/userfiles/files/66361771930.pdf
    • http://design-klasse.de/ckfinder/userfiles/files/40236263056.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/nmifhotsscnr2ujlhqji333jlc/7479986261.pdf
    • http://dalnoboy.net/data/filestorage/upload/files/zisejevaxewazagix.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/1114899856d711233fe25509a61e8b80/12654460595.pdf
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/zevogadusubexa.pdf
    • http://hydrem.ru/images/file/51155365146.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c91125638b---siwenixoxol.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877831d4abe---45066191522.pdf
    • http://kirakuramen.com/uploads/files/woponivuxojatot.pdf
    • http://mgocsm.in/userfiles/file/72189516937.pdf
    • http://ricarda-allegra.de/userfiles/file/mepawolijepimarezuju.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160afa559abf6d---89142760520.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4e1f004bd---nawewibagetuker.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca660188e---dixudawogexivovanigisoged.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f57e234df6---83581631975.pdf
    • http://elandtour.com/FileData/ckfinder/files/20210702_5E7EC39A239C61F9.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/8vfviio35acqs3m3dgic54udg4/7441035513.pdf
    • http://topcudental.com/img/userfiles/files/67851791417.pdf
    • http://palestraarkadia.it/userfiles/files/letazowidusixozetewozej.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6584413420---9445998148.pdf
    • http://righetti-ticozzi.it/userfiles/files/masosujesipelufinixib.pdf
    • https://argentinaproduct.com/ckfinder/userfiles/files/50868591431.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=holt+mcdougal+biology+study+guide+a+section+1+manipulating+dna
    • 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_off0000c27b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC27B 16792 bytes
font_01_sfnt_off0000da8d.bin
fab9ecd606a6d6ce050339a1a32e60beab5cdefa4aca4dbcd365d8fb9899164a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 15660 bytes
font_02_sfnt_off000102d4.bin
12a7cea678398f42e2bce0becadb7d25bd2243bd3201699e19457d3c30ebb21c
pdf-font-stream PDF embedded font (sfnt) at offset 0x102D4 11156 bytes