Malicious PDF — malware analysis report

Static analysis result for SHA-256 e037c472f8619a16…

MALICIOUS

PDF

117.8 KB Created: 2021-06-30 10:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 55b44ab12d6cbc0ea573adcfa0578379 SHA-1: c37c6071509492e361f7a25f315e47d738fccbd9 SHA-256: e037c472f8619a169b8be1960a73c8c7225313dddb859404ddd936c0861f5e35
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic findings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://vogiantinhmach.com/media/ftp/file/71277401008.pdf In PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097148572b66---64720289340.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/264537fa207337180482107fefde24fc/xarorezexebezuni.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096797c1994f---dokalizupo.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/d6i3j7qgg7bmls160rtd92suns/tepipusujuvebebezovob.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083e36bda807---zigejuzoke.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/26f8b97d0ba2430d8767fa4db6bc49c2/23458102547.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e309679a17b8da0cad28befcbb423965/61690182200.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c612d244abc---97692885389.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16096133b6e670---mitat.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/66640763425.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072a37c84a3d---284586414.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da2b1014459---73120812856.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/78368595199.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/59442712323.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a879c58bc---zilukumomedebamavo.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/xofupuvazalimininu.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/1d9c6ffe69e1760f308e828cdb8844e7/45157056005.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e932884c---wofasagojozukexulafudis.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/9aad1f2bcfa74fc33cf52f5ebb577244/97766984076.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/dozawavotodivalariga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=difference+between+radioactive+isotope+and+stable+isotopePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15900 10904 bytes
SHA-256: d70cab8dd4d88799d4dadc7460043f382838fea425478ae66bcab8e144ee3a4a
font_01_sfnt_off00017241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17241 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A53 21496 bytes
SHA-256: 45f4981ec7343770ef210ec1900cf7fc81d80c2a9593faaea8fbcf5fa2d34002
font_03_sfnt_off0001c0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0A5 1768 bytes
SHA-256: 0d948444844f76fb5b41a72cc209ed345d9dc48be39d08bf7609e43e72e02126

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