Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5bbfcd7b1711c6…

MALICIOUS

PDF

73.4 KB Created: 2021-09-01 15:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 40f9e06e71c63e273aca8eead47830dd SHA-1: e9db5f0a3f2e11445aa5cb10faf4cf4f3ffec78c SHA-256: 9b5bbfcd7b1711c6be6f366c8357bb01ac06e7db98ccc1e82716a502095c85b3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by numerous links to external sites, many hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads. No scripts were extracted, but the extensive use of external links points towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chcial.ru/uplcv?utm_term=what+can+we+eat+on+good+friday PDF link annotation
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/8e6f3c0dc755fd16d788a47e836932c8/bofojebajafitegopamefas.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/nofusegeviboradixiveb.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3dcdc6341---sawewuzolawosuxos.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114783d2d3cf---begotumetaxadurelidefogop.pdfIn PDF document text
    • http://totaldeliverancecathedralchurch.com/clients/2/22/22dae496a1749ae881e6bee195142b05/File/42934748432.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/c04kboqr4tsnpscvf7gg51usfv/laloxesivibak.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/95593915911.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/62309855540.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/959567b321b374491a04d49bce53055c/namoki.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/sagamiferik.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/furomuwetuduvimojisodel.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/95c63b1d46a83744d9aa255318730a81/92488325091.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/nawilifenuxuwusojaxukor.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608582a366615---5396138222.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/6080344717.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/50047811522.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/36083274347.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/90425500513.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/81966050703.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/3de6452201e00c52b04ea57a797104ff/vidabibawuvuxolazez.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/45709734786.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/gikozegidi.pdfIn PDF document text
    • 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_off0000c0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BC 15044 bytes
SHA-256: 74e05ba6af59713458227c3feb78f463011c58da72990b81d61f1d009aa8e18c
font_01_sfnt_off0000e67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67D 10732 bytes
SHA-256: 6ff3be26127c987604c07e32187b2375e3954772ac75d3e1cedfbc99dc01455b
font_02_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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