Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc23169156e982dc…

MALICIOUS

PDF

90.8 KB Created: 2021-07-21 13:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fbae6d99325e3fcdc3e594a684c60aee SHA-1: eea946ac02348b9d6d3439613bf1b6770337957b SHA-256: bc23169156e982dc3be1d3b988da47e9dff23b08567721c2e11e0f4c5ecff101
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/vmvd14prs3ffef7rjvkl2h4ge7/53349811761.pdf In PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c00b3219a---zuziruxanol.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/zopupavureraxiluwirinaxeb.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/okcjdt5c9knrbmomaockcft394/mixajutukosiwesewab.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/ab08754089899535f792897b7cf07c2f/92333449048.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099da354c8e8---70120201646.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/9a6183526cb3b34149202ab84c2487cd/41700326066.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/werexapogazikofomo.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a07fb28cc---tesibebowudugip.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/pj6tmdm5q64u5q85poi89d7v5j/85012688286.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77be21adf---57035859928.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/60169499399.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/vobugolug.pdfIn PDF document text
    • http://ipceurope.com/assets/file/85756145980.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609b75677198f---6896173707.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160808fbc94663---wazobokajenujefinol.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/42448717648.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ts20mg6ifb4sdp4slborra5p62/xobexosowesorojelufofig.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/24303344564.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/71d2216616a973a171485e14d77719d9/livujuzonilafopog.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52e783bf3---34983922210.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/nidixifelajepulive.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/e3b8be3122b02b9c4c92634d066afad3/pekas.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/20074406393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=lectins+in+fruitPDF 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_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 17480 bytes
SHA-256: e6691228ca31014b6ea2ca7930fe26c390d684df050b2d63cbb85789e937cb4e
font_01_sfnt_off00012e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14654 10060 bytes
SHA-256: 974b5a76ae3a385957659c9c1ce2e96f7b66f0c5de63403e539abd2cd2ab1a7f