Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab75b7f8f31a6594…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 13:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f16944c17bb313b9084db4d752057939 SHA-1: 3320793f6f8c4489a6545bfb96bd6ad8f9e2318b SHA-256: ab75b7f8f31a6594c932f5d2dcab75d40142740c73ba31425a63ab5941c7e9c3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further support the classification as malicious, likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://s-serviss.lv/userfiles/file/rijupezitet.pdf In PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/55072569591.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a5d199e2b---69157202115.pdfIn PDF document text
    • https://linardi.ru/files/file/kuwobixaxafo.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/23271482337.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/95542175532.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/miparuko.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/93005b30833f05d709f4a8dea5541a8d/nimonel.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/27876838334.pdfIn PDF document text
    • http://torgoborud.org/images/file/rolukumapufuwofemimofotiv.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/96063394344.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/43055512080.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/79230895714.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/gefamuluxipawuzexozejetat.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/58764616911.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/goduzugitasifewubeve.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/47578082a7079bb2c85f5fd29c194cdf/samowixodaxekabo.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/80abcca5888de8537da9712ced31cf2f/52348126176.pdfIn PDF document text
    • http://parilka.by/var/upload/file/torufodim.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/rezugagirukez.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/xubipilevujifimaref.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/sezorepewi.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/58538854965.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc4f935755---80575456749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=savage+worlds+pdf+freePDF 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_off0000d901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD901 19132 bytes
SHA-256: d33cdbdf10d0eb6fbfaf9db4de4d4dbcc1cb2b896f8811ee8972451557f544d5
font_01_sfnt_off00010a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001229e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229E 10604 bytes
SHA-256: 8850be103c0ac74c3a4c09c929348a1549d87dbee62761f1fba22f7a3df7c25d

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