Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0e72822db5f560…

MALICIOUS

PDF

71.7 KB Created: 2021-09-28 18:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8711dc8c5ac9bcd497fb8eb4f7ef0c5 SHA-1: f1932373a67482e62a2a96cc8d3bb624eaa51580 SHA-256: fb0e72822db5f5604fc806a0d896c4abebc79d96d498a6eb2bf74afbae4ae809
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=como+desbloquear+un+celular+samsung+galaxy+s3+mini
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/tefexuvup.pdf
    • http://bilcafe.it/userfiles/file/34557689380.pdf
    • http://heathrowairporttaxi.website/userfiles/file/58381230008.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/4dece7598d9e1dec986e9f67b76e590b/mipanokinuzaj.pdf
    • https://fibra-optica.ro/ckfinder/userfiles/files/45421563521.pdf
    • http://spy-military-labs.com/userfiles/file/sofowuguvisetarixate.pdf
    • http://go-pxl.com/uploads/files/98431686061.pdf
    • https://miminku1.com/contents/files/34583025082.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/rowedif.pdf
    • http://1544-7419.net/upload/fckeditor/file/lurujibowowaz.pdf
    • https://ijestr.com/ckfinder/userfiles/files/xorogoni.pdf
    • https://eclearusa.com/images/file/42993262225.pdf
    • https://vpmemorial.net/images/file/verasolofeketixe.pdf
    • https://budgetparking.ca/admin/uploads/file/jixulomiguzakerojepetuwag.pdf
    • http://e-skala.pl/userfiles/file/89448037488.pdf
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/26303066030.pdf
    • http://ontozescentrum.hu/tmp/59207332925.pdf
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/24924031042.pdf
    • http://www.cddfct.com/up_files/file/wikuzobofexuloda.pdf
    • http://daiichilogistics.com/uploads/news_file/15913435489.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/579bd8a4e284000ae66bbdb0e684f17e/wifefaguned.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/4gjkcl5q8ilgtsmhm4b7je7o07/pekusadalizew.pdf
    • http://helix.chuing.net/mai/ckfile/files/mibarubadoket.pdf
    • http://krukewittfarms.com/userfiles/file/34318049762.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b03f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB03F 16792 bytes
font_01_sfnt_off0000c856.bin
9e4bba990fba4f9f8531dddd049d6aefe798944c82cc788ee15a64a672249f5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC856 11420 bytes
font_02_sfnt_off0000e2ca.bin
726da7aaeeb0156dc1fa99cb6e90f3c7483dc537595233e8486d8cb4c3a7bc5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 17024 bytes