Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd487c3f88989949…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 21:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6d5130a117f5082f5b7ade3b5663a022 SHA-1: e391b17446d68d10f27f6260999a4bd5e745aac6 SHA-256: bd487c3f88989949a2fb8cd8e81ddc2198c149a0bc9c47eaeb1e5719f2f08e50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures or malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=solidworks+2018+sheet+metal+pdf PDF link annotation
    • https://healthmatters.me/userfiles/file/6768437365.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/677132d6597d6b01ee3c2e65b1e26d45/turoj.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16077356da0827---nifapixakiwavasexiwogikat.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/muvegojirewibixifijo.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/71237333200.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/guzorux.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/62096121471.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/30744795575.pdfIn PDF document text
    • http://houselandia.ru/files/61184322265.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/thfjor734mqh6cporsbmj8j35k/46669675598.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c282545c9b6---6869534525.pdfIn PDF document text
    • https://linker.tw/files/13113582029.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985aeeefc34---46834135671.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/gaxunakefaraxix.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118b6b507253---33104203670.pdfIn PDF document text
    • http://demkapi.com/resimler/files/41277207473.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/runenosemujafininuxibifuw.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/a554dc8a9d1864b0576e67ce9c584eb9/91273190935.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/1cd1eae71eaaa1c8a2c6db95d7784436/mekiruwaned.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-12/20210712211704637252.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/8da03f4cbffb821cf8750223544aa11f/womilesutiwogax.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/meruwesenirudesivipujaso.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/67ce4d09ca2f2ff09a1c36d3aba368cf/miwasumosuduvev.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/9dfff1affea7ca6a36e7d57b7675e534/tesiwatofumisoxedagamut.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_off0000da45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA45 17216 bytes
SHA-256: 6683804180e9cf402f202911c1d186d94ed064b4a4d43d4038471c73130ef180
font_01_sfnt_off00010736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10736 11416 bytes
SHA-256: 01ed119caab17663547f0f3b702c825301ff239b411e9eec7a22021887ec93ac
font_02_sfnt_off00012243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12243 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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