Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af6aaee537ae841…

MALICIOUS

PDF

75.2 KB Created: 2021-09-03 13:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 05a28e5e76c10be12364dc75f7edca93 SHA-1: 29e2121aac1ca7ea3bedbc5569014894e1fe93c7 SHA-256: 3af6aaee537ae84128a888a95dbf375a4a590b88ef67c798fdf074666767cb24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://andrelandberg.com/userfiles/file/zomimikikapavup.pdf In PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/132b808df26ee8177a3c5661f145142b/54608293298.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/junotufogifeta.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/50094354296.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/baecdfff92b711901341c5ff343b2c4a/mojemofir.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/jubivimixag.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/pinizovitow.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b703427bc18---figik.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/ziwutowidewaga.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ltjfugss8al3b2b1un3pg4ifq2/rutiwi.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/lamasovukazafozul.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/66295689028.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160901378301b4---goxivowavitamojemazaja.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc910053d4---55902290657.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/kimasupufojafalijadute.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/36906920248.pdfIn PDF document text
    • https://digicpictures.com/downloads/zosaweba.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/25591647064.pdfIn PDF document text
    • http://isgsrl.it/images/file/1498007320.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608559e2c15fe---23309860463.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7cdc5901---50396875607.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8efa359d8---89730820623.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/25424156189.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/71087477757.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/sdja26i2d7glhonm05jgkujjn2/46351141499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=north+carolina+medicaid+provider+billing+manualPDF 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_off0000c183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC183 11076 bytes
SHA-256: 30344be42eb07f13266fcd89248aa400388f035f530a9146be769d435640f64d
font_01_sfnt_off0000daaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BC 16848 bytes
SHA-256: 51d88c8be32b2d8ac083d70c41806391e765cc1ec5173979e46d5c5e1d841b9f