Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc69c38201767fc…

MALICIOUS

PDF

86.7 KB Created: 2021-09-19 23:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8bb0bd7511a6eb06eb21e661e99cea81 SHA-1: 8240d3b812009606cf095e1299e58176c4ffea55 SHA-256: 9fc69c38201767fc7618a805fd4a5fabf5977d290a4148af3de5fc87c85ed8e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to manipulate search engine results. The PDF structure itself does not contain readable content, suggesting its primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://studiotecnicobergamaschi.it/userfiles/files/97867290916.pdf In PDF document text
    • http://rpsbchamber.org/editorData/file/12722747945.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/retaw.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/femomuzin.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/74151016804.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/xubavomubinonogowum.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/jigalimiliwukalowafawi.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/buziranojizapel.pdfIn PDF document text
    • https://petek.biz/resimler/files/96952275219.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/22486463420.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/ripul.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/52710398369.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c842b7bf261556d97ef3291d7f199903/37935803562.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/pifipurojudazid.pdfIn PDF document text
    • https://aksusu.com/upload/files/85593684611.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/misewozukitedijofi.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/gebaliwebejurotabam.pdfIn PDF document text
    • https://n-tlg.com/files/file/21180584847.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/76344565225.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/mubotevibune.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/29055386706.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614252a58585f---zijudowax.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/165jfh3p18inbictl7skjql9nd/54874913541.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/wopom.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-3/20210903132311717263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=if+camera+is+not+working+in+androidPDF 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_off0000ee12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE12 17656 bytes
SHA-256: df30e8ee2a8dea75f9b31117775b4b61b96bea483e2ada64bb69f0b120f1e079
font_01_sfnt_off00011bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCD 10904 bytes
SHA-256: 15aabebc13380c6dfaf80dc671eab55fbd54ce2e6cfa0da5707283c4751c1fbd
font_02_sfnt_off000134eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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