Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cdd8284295a95b…

MALICIOUS

PDF

135.1 KB Created: 2021-09-04 19:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c490685ba40e22263a3c916ff3c2e057 SHA-1: 27b726979278d352442321a1e17013e60a5ea816 SHA-256: 91cdd8284295a95badb0d7ca67f25fd80ea9e4b3ec90493b8727e17268974bd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous links pointing to potentially compromised WordPress upload directories and disposable hosting, suggesting it is part of a link farm designed to distribute malware or facilitate phishing. Although no scripts were explicitly extracted, the nature of the URLs and the detection names imply the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/d784icdd932hdfnv3s3ihdur82/7160631148.pdf In PDF document text
    • http://georgekoldun.com/var/upload/file/zajawa.pdfIn PDF document text
    • http://petrduchek.com/files/91207999810.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/7573586768.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/44579967342.pdfIn PDF document text
    • http://mcutech.net/files/96334060955.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/33206591385.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/mofowevukisogisagid.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94cd45cc65---18933292974.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4373ce7e9d631ece49a752c1de800a96/90112412421.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2356189dd---81425944386.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/kopaxugewenow.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/430c32990er21ve7p0dtjbnni3/78400258801.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/56863743188.pdfIn PDF document text
    • http://mariancozma.com/_user/file/78914121995.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/27150808256.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/8639bc027773cb711ecb215800b60a59/79385450528.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/672838e121d526f492a394c039ccf57b/70267670369.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/lamum.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/73136423209.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/17565900120.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/puxozutipojuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=les+maladies+psychologiques+pdfPDF 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_off0001a299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A299 11080 bytes
SHA-256: e89a9b6a787178044e78f981a1ae4d381c5f118672b567b011f541013d24c70f
font_01_sfnt_off0001bbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3F1 23320 bytes
SHA-256: 3e84f69dcb71cd592c680f01756d355709076c8428bef52fd3ee36ccdfe3379a

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