Malicious PDF — malware analysis report

Static analysis result for SHA-256 567b3a748cb64f8f…

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 07:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 526ea4df5f0e13855f3bf36b7b6588f9 SHA-1: a26e559b4391f803dca1ab4eed2b82fce515050b SHA-256: 567b3a748cb64f8f6d5d5fecbbfa92c0c7f751c1c849aa4460be76e8d10e0b71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest the PDF is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://smidgel.ru/uplcv?utm_term=research+methodology+ranjit+kumar+4th+edition+pdf+free PDF link annotation
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/57686243377.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/eff6093efe4e96d86944dd5d1a8cdd52/67187037433.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610269f885060---nilofexugolesoxatumaz.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/e4c6687812a6c859c72fc9ffa8158db1/tutivabikosoxilupizide.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/73756366335.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/jixetipigujubadofe.pdfIn PDF document text
    • http://righetti1970.com/clients/872956/File/44262344381.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/c78e499f7d1462782f4056c47786f235/15738965658.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d66c407a5130c7a7d66a4d3c9fa4eeec/gomopetalixojedaxum.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908be26f9a5---91662364916.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/vagosonisuzanovikire.pdfIn PDF document text
    • https://coatielectronica.com/files/12096208860.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/46265389864.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba1c1f551---koduvuz.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/373d1b40ada8a731e364d7bedf051c04/7033343170.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/p2aginb70qrbo9te8kfg9g8igb/negowalevirupupelogevoga.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a233b283f8f5814fc1d44661f6805524/xafiridofukufup.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/6051065717.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/96946886162.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/nelosugedixubudikovo.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_off0000cf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE752 11628 bytes
SHA-256: 9f32c3a9a9a2bfcdb1f26d5ac44d66f3c8763b3689381bf7d7a6eb761b9e5d01
font_02_sfnt_off000102a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A1 18188 bytes
SHA-256: 449b6444517db7b21109083ca26d9483577923b50ef16232db55e4ed37121b4e

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