Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f56a86d809f37d…

MALICIOUS

PDF

70.3 KB Created: 2021-09-12 05:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 30e18e3e60536e971fd660a6efea499b SHA-1: a73df04d823342e2f159c1bc69659c1d11ae8487 SHA-256: f7f56a86d809f37da833a611dfa04cfd0eb14f577d836722c31587778c84745f
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or domains that appear to be part of a link farm. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 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://castilloexterior.es/ckfinder/userfiles/files/19284631405.pdf In PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/bisekubusezijixogadimu.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/fiwumakekuwi.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/61182663140.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/suzur.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/be53e88e1043d9f3a484317ca96fbd08/zifaraletosodutabujul.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/39007821651.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e532225a9---2420040628.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/13256874885.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/xeziri.pdfIn PDF document text
    • https://semut73.com/contents/files/bozibivodof.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/wugofuratigiwuxi.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/15306071743.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/51315750244.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130685c94290---tulutomubadumu.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/fulilununenakaburatijol.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/pazelaruxudavan.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/34673008341.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///nomuzis.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/lozoxebibabepo.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/ziwotezidefiwuwobopano.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/fujosazipalafiwun.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/gajed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=implicit+partial+differentiation+calculatorPDF 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_off0000b4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDC 10664 bytes
SHA-256: 398be6b89d631da74eea31f26a4a5115d9d28856a3a0559aae8009dd4c248f6b
font_02_sfnt_off0000e534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 15160 bytes
SHA-256: 3fb5219d00ccb9207db0b23690a3cd161de88790cdc35240aeac84873797f659

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