Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb88a893dd5a146…

MALICIOUS

PDF

95.3 KB Created: 2021-08-13 00:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 06567e39532259b0983a833f1f2eca69 SHA-1: 486e8f0deb91b9aa59d16736b08292e5c22c7312 SHA-256: abb88a893dd5a1461e131f0fc557bc17a2363678ff3c3847c4b6b0bd8cc8b80b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple compromised WordPress sites, likely to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF being identified as a phishing trojan. Although no scripts were directly extracted, the structure and heuristic firings suggest the PDF's primary function is to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160d26417f0031---55136064714.pdf In PDF document text
    • http://savitaco.com/uploads/images/files/60091801924.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/faxebikajimetiwafafaz.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/6843549347.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd1a52c76---zopukugugorifavileteb.pdfIn PDF document text
    • http://nineslash.com/user_file/file/28770013037.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/75a164bca9be91ed686c51e888f46cbb/86892128961.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ugvvnn0ev0298ija1fralbse25/98670002627.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/wozono.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/nizolukugi.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/vogalevolamomovoxalo.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/semijude.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/281235004556.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/214f5148f206dcc01b829a2bbbc76d6c/xepatigasigidow.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/28110769e59228f4544788de5c5924a0/22778022392.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c19ccc2c637---vopepobizofutip.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/fekasefanivagamob.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e06a600b9---varekizuparebogunidagupu.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/8c815196ed9e75ed02c8bbf035106440/baxalafofodowopotunaru.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/66a79cfa2e5ab4de86b65f9b03ef28cc/47441067136.pdfIn PDF document text
    • http://capital96.com/userfiles/file/98379072702.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16115945380e17---ladako.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/4192530056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=3+alif+lam+mim+full+movie+lk21PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC8 16620 bytes
SHA-256: fee8c02e86059ff0f184dbd9c74119622623fe2218617eec53a294059f43020b
font_01_sfnt_off0001124f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A61 16932 bytes
SHA-256: 561edce7593749042df476e85df42306d975cac6af09f09fe21617057a5bdf66
font_03_sfnt_off000155fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155FD 10408 bytes
SHA-256: 34befa04bff0bb8b587428db473a5009613abca143403ca732c5b8601ecff4c0

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