Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf2541060cfb08e…

MALICIOUS

PDF

84.7 KB Created: 2021-08-07 12:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8a0f364d419ec51564074429b1011100 SHA-1: c15d1df46710e701e1dd3dd608a46a8caa2ddb28 SHA-256: bdf2541060cfb08ebd74b482b6f3e7bf9afb047618004c3c8d5df01822617d78
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a PDF_RANDOM_URL_LINK heuristic firing further supports this, indicating an attempt to obscure the final destination. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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 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://philabc.ru/uplcv?utm_term=how+to+write+letter+of+resignation+sample PDF link annotation
    • https://verandapattaya.com/userfiles/files/41724155800.pdfIn PDF document text
    • http://ledins.lv/cms/file/digolajofomixa.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/pitukezajigawozademijetu.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0vm9klrigeku9va0etq8dfetu6/rigutu.pdfIn PDF document text
    • http://chromoink.com/updates/file/52702600758.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/bawativefiv.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20beaa73f---sekalelazifaf.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/bb95a53c0a02fc3a1d809d5788765668/zujubobo.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/32167622940.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4adadeccc8---nakarog.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094d4bade475---8841128331.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/49885643382.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077afd3d846b---655748438.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/pepebenibugufolapizuzu.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e97896daba---wadibetodu.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/f31c8adf0b73cf5f39d2249b278b8536/46355645988.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/58094302757.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33940ae3b8---99447725492.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/47e61d87d7ab20e9580eef47f6ef7100/bafumorisagibivolameg.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8e1066e08d---36251541290.pdfIn PDF document text
    • http://totaldeliverancecathedralchurch.com/clients/2/22/22dae496a1749ae881e6bee195142b05/File/fugarazevitiduxuduwuz.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/4694afc57dd77d3064aa058c0966394d/43111120899.pdfIn PDF document text
    • https://anakaygame.com/calisma2/files/uploads/79956178634.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_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 16372 bytes
SHA-256: 189430f0aa04f2122d0662e83dcccf790d7fa1743fc2f0bdccf9c36860e4f1b1
font_01_sfnt_off00011497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11497 10776 bytes
SHA-256: 709510354b19e1eadc343c12202bd4bf6f1180c9931c1012032fa25ab517f769
font_02_sfnt_off00012d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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