Malicious PDF — malware analysis report

Static analysis result for SHA-256 f763f71fc8c2d7a8…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 01:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 04f75a02f0cd7e3436a8fa905d1ffd4a SHA-1: a45bda65f79e1bd9d7fe29027859ba6b6918abfa SHA-256: f763f71fc8c2d7a8d8de8def97a73decae78a9a4ece65d504b697e2a4d02f7ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many pointing to compromised websites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. No scripts were extracted, but the presence of external URIs and link farm characteristics indicates a likely attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://hotelrealerimini.it/userfiles/files/58099968368.pdf In PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/5ac4292d9190a4268191b77b4668432f/29836801983.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/zenikij.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/46076193829.pdfIn PDF document text
    • http://djapm.com/userfiles/file/netel.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/fuvumajubinul.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/wudiverogo.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c69b332b41ebdde187053c86d92f176b/gofinulufowonugozijuwon.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/u6h4sad273jo2ualusfccpfs63/lofozigozadudafijixif.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a85c7d94683---rowatupawafejolemizubatam.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/mrvs8djamc7dbajk4gco7h1hv7/lujuwigi.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/barifozekidajowaxe.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1810e660e6---4721411402.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/joxosunidiwazokuwipebo.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/79845596e6dd2ee93ebde0e7b178555b/tumatemarowanopolidoki.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/96f4b349bda0d7707ebb35bf72e3ff2c/zawubuximumokulademuzako.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc41b97c9d---82299946829.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/rijufuxufumodut.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/72824853473.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/kupuxojekexugitaronoxebo.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/90804603721.pdfIn PDF document text
    • http://bensonhigh67.com/clients/55910/File/74189353989.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a296482114---wurudewujowesibexuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=gnossienne+no+2+sheet+music+pdfPDF 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_off0000d2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BE 10836 bytes
SHA-256: 94ca902001f81a848c6ca3c07682ac676fea0b727a99d58dabfb63c1fbebac8e
font_01_sfnt_off0000eba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA2 17044 bytes
SHA-256: 6cc72fe9bba77de0b5ba669594a258db66f084d66d2ceafe67fe5e5fdcb30046
font_02_sfnt_off0001174e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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