Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e85187eb4b1e8cd…

MALICIOUS

PDF

106.2 KB Created: 2021-09-04 00:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f882bf1bf6aa6b1839cb384d84ebca20 SHA-1: 9c90618016be864c371204d34fdfef54731fa265 SHA-256: 6e85187eb4b1e8cd07e0756ed81e4d61e09d4c6463b6a1c53452269921961ec9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f006380c9b7---bumigero.pdf In PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/vopjf3inav35ganl3nr7idrhc5/64957768974.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/sosugasaponupojog.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/dutigazopetukizoba.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/muquajeaigtb8ksrklb47rvb1r/xunakexoxu.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cea8e0716c---kazumafara.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/45970357860.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/julisifuza.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/efad8de34a83082c2dac677fe9c9d571/65214952686.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/1afb1f051dc212af792b76bb3fc4c6ad/40687962734.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/19781593660.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/qoii38d9ih8q90n5qioqpu0ouf/kagemezesuzimevabolebal.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/6839360867.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/t8c9d39c0qrhrap1asjsv9acr2/61381625487.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/bivadexed.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894b053445f---76563125390.pdfIn PDF document text
    • http://potya.com/15929996456.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0bb9c6234---12274487821.pdfIn PDF document text
    • http://krossinkeuka.org/clients/c/c6/c64aa726effa6776341672ea469011e7/File/xapedotutiwabasulejetek.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161115fc08573a---23416782656.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/jphftpuglt96p281ekbu1ah9n3/8362870921.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b00ff4af37---67938254228.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/forisulosowodiju.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cu1jqq1s39u5fro7f26p0a0ue4/5975323737.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/naluni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=momotaro+story+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_off00012c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7D 10392 bytes
SHA-256: a258aaedcad231313301d806eb6ff4d61fc5e0a0b691bd72035908470344758d
font_01_sfnt_off0001440e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440E 24112 bytes
SHA-256: 4178742a1b5beed29e140d90a8300cc6bf2d09f681235772c90d0a189fbaa89b
font_02_sfnt_off0001832e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1832E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1