Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f554476cc9110c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 04:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 44f7716b4adb1013d017d7f17a7270a1 SHA-1: 8582e168506bf6d1afe0f3dcbf041e612bb21ad8 SHA-256: e7f554476cc9110c17be80d67ce1132dd3a3c03fafe13d8ac3e2528f464ae9b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. The presence of embedded URLs and the nature of the link farm suggest the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://faktxeber.com/resimler/files/bakiwonumowuni.pdf In PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/6281cee4e23b44d3bf0c5c609ffc7040/92007250518.pdfIn PDF document text
    • http://dothi.info/images/files/34908860673.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/rowuzaw.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/toxixesuxawozi.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/juvovos.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/pomejitanuwiriro.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/gixawaribi.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/patoborarawo.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/91348ed9ce43c8305518a9f28784758b/naxuxutozez.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a28db64f36---89130280048.pdfIn PDF document text
    • http://mc-opony.pl/files/file/vogugojebalovitujanixubep.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/r4sf0ek7i6v5ag8sc6f76mb64s/porivibolatude.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/80076122675.pdfIn PDF document text
    • http://toyotarentcar.net/FileData/ckfinder/files/20210629_FE71A76542D4E356.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079045b1de38---zikinug.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/ledew.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/77301011babcbb8cdabd262bd4f1da13/30434567152.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/51c3f6cbac0027bf213cbf137af6015d/nijikokesemabu.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/doxiw.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/57fdf7babc4ab456098712ad806dba48/13489317300.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/wuximuvi.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/39bde5ab009a54a60d865510fa05ceaa/36169351478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=osmanl%C4%B1+devletinde+ermeni+meselesi+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_off0000de03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE03 18644 bytes
SHA-256: 2f30f7d4461da3e73210b47c4d832c7de2ee899e8d710142700521e0d8eef0f4
font_01_sfnt_off00010bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB4 10676 bytes
SHA-256: ad85bcd40697b30c04295889b00f3a20db0603850c3566d06aa9fa245c501611
font_02_sfnt_off0001241a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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