Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb13ab5bb37fe6ed…

MALICIOUS

PDF

70.9 KB Created: 2021-09-07 13:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 480ac1464fa2f47479e284e52fa449b2 SHA-1: 2297f859f02b806c1dc9d62d9460390a1e3acdd5 SHA-256: cb13ab5bb37fe6edc604cb23a35fbe01634bad5c78ad84fe98729f3d2b9320b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms strongly suggests an initial access vector via spearphishing attachment, likely designed to lead victims to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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 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://pmeds.us/userfiles/file/leboxebowole.pdf In PDF document text
    • http://aceonlinementors.com/userfiles/file/86357231807.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/e9395b4f3bcd9f786f565ed03a5c7e7d/juwupowenobalufoxunikap.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/lolenuwawefoxir.pdfIn PDF document text
    • http://bgindus.com/t/tutorfirm/uploads/ck/files/79041864725.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160840ea7a945d---44702836865.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/jikepupinurutafixumep.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/7fd648f2f6213cdcb69d39c3c8436a01/80730727249.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/dukoxixevuwitekepogo.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160944c811f82f---legeteril.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ro55vlt4u0lh86e01kism07sjv/pefesutopapu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0cb25fc9f---bawosaselaper.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c0b370909a---zizijeti.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/e6473037aa6327a6f3041659347d1d72/45157894010.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e265dbf1f---84057490914.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/90076967390.pdfIn PDF document text
    • http://peak-experience-japan.com/34230787872.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/459e1167ca4cf074dabaa0082b8d1033/fekanobuwavajopuxo.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/katat.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/kilaj.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210831032810.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/modimiposuribasutowu.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/jl2qsv6hkdnt7g7gl92vt2gal6/fedefipojileme.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/67688728314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=phosphorus+cycle+worksheetPDF 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_off0000b607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE19 15728 bytes
SHA-256: 1e86382801eda56480e0daef4f0a2510a745dc342419fa34c501cc69c4b6e074
font_02_sfnt_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 10508 bytes
SHA-256: b8b4cc1c5b95d7648a67fb6b740297554a9835a410448f86e579142e5a4606b6

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