Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdbbe124a081d949…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 18:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd7a9b43a93fc00de5a13caf62e29bcc SHA-1: c919a2e172d73a0e83fe60c554a6c10473e3ae39 SHA-256: bdbbe124a081d949299d6655c3bfe16e3aec537fa8d98bbf665fd7cb343fd558
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely a phishing or trojan delivery mechanism. No scripts were extracted, but the presence of numerous suspicious URLs points to a high likelihood of malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b2e434547ccd057f4b15eb080f7f20be/mirixupejotajive.pdf In PDF document text
    • http://mmdplus.com/userfiles/files/20210905_230352.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/14852778905.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/73770283146.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/sedoke.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/f3fmcn9knk3fat1ula2dfa6t62/78277478748.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/16700504470.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/gugesometitoripaf.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/jidafupifulakejedis.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/48351676312.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/23825658968.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/94694460002.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/sefibegatimogavu.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/zegunex.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/54485789691.pdfIn PDF document text
    • http://belean.pl/userfiles/file/22708768553.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/fisumexapeb.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/wasutusib.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/wemarinefinadukukil.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133b667f03cc---80393937213.pdfIn PDF document text
    • http://mlead.net/images/e/file/fujakuvenonizomuni.pdfIn PDF document text
    • http://qdjshg.com/files/file/nejopekuwetodopafexo.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/eaaaad9f1e86ac7a1b84eae940aa70c1/65999747245.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/88661757931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=android+version+10+installPDF 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_off0000dcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD3 17944 bytes
SHA-256: 0d6b7019eb23b8ab75e2ce6c7b14ef7244d8e86d4bc2d3e9090e8a4c056c326b
font_01_sfnt_off00010b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B78 10464 bytes
SHA-256: 5933f612351509bdb6f9ee46f4dee6ea02d6fe74d2d7d43312826ab407554e13
font_02_sfnt_off0001236c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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