Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6beeb7559cb3462…

MALICIOUS

PDF

88.4 KB Created: 2021-09-19 07:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: abb8523933ae6f8571410bcf819f209d SHA-1: a87d61e28dd650158a0b3c4c6ee1ae0f906e44d7 SHA-256: b6beeb7559cb34628c207b89a9bfe28d7ca074aca722c6ba780ed78f61ed7b0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure align with common techniques for delivering second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=free+music+app+android+offline PDF link annotation
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/92560378525.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/rulas.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210918083141.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f461858836---30179368631.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/28ad5ce4b39d95baaa7dbf67840bcdfd/44330906759.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139ee3a4bba9---dabisemaworukawipudire.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/16372249516130af267ab2b.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34648678408.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/gopusisadab.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/55505530320.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/91353527781.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/90614696608.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/webolovejiwelo.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/xomilubonuzugav.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/nagavenoximubilifuriw.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/55362502407.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/dogasugalaxad.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401879c2d87---11058169858.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/78158363407.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16130e73d0c1f7---bazitekizolalose.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/98752db07f33045dd2a72a9e1626b553/dezogawafijarawiwonojo.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/71331225311.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/siwapanugatokugixifir.pdfIn PDF document text
    • http://serting.eu/userfiles/files/80612846819.pdfIn PDF document text
    • http://houselandia.ru/files/velepalupow.pdfIn PDF document text
    • 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_off0000f556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6D 10760 bytes
SHA-256: 899ae0d762248854cceb7d65ae30947bdcd6cd5f0987d3c9e2789b4c7f993cd0
font_02_sfnt_off00012614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12614 17624 bytes
SHA-256: 58f0f8a60d3e1c6ca99fbbac39c7472aa1060f1f9846bdfd97d5cdc53731d0c6

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