Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6671679b82d3fa1…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 12:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 965405513209d2a41dc0fa171d460c2b SHA-1: 6bd6ace4769c1c039cb6012feda6968fd75f4172 SHA-256: a6671679b82d3fa1c690154122d102aec6b28e2e53e9cb162bbd749b59e8c392
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS upload storage and disposable hosting. This suggests the document's primary purpose is to redirect users to potentially malicious external sites, possibly for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://sportyou.fr/ckfinder/userfiles/files/menadoziwotenifetabisetij.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/154b6c546109654bc307ab100f336b27/87822418826.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a673503691---zujanix.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7ef8eb9ec---kidurunorosuropomonomiler.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/seforesapopajotisexotezav.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/damebagakokavedox.pdfIn PDF document text
    • http://eternoohydro.com/d/files/90009754157.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/fowofojilin.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/8081510791.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131258f5a538---viwoxe.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/10474331704.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/e0abf7bfb8febea7b45cd61de10d5069/fowipotijabori.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__61346A7095743.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145345044fa8---zubopomevozozu.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/matenivobilizev.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/biralixuf.pdfIn PDF document text
    • http://fourfoods.com/images/files/sopubekubilasomi.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2474b0616---82179500853.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/163194372899.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/31768770153.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/sisegusutotawolumuviku.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/xalewutevusiti.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/81a6967149e2484b711caf9acae1371f/4300052588.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/67373953818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=not+getting+messages+on+my+iphonePDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/gesalibejebawup.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_off0000b276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB276 10644 bytes
SHA-256: 9f270601582d6eade8c6d847b122f7d464a64db0c5226abec3281d3ef3b2cc03
font_01_sfnt_off0000cab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C6 14952 bytes
SHA-256: 35841836dd1047b1311b7b6bbb82e3e58fbae176ede13e646787cf515a1fc99f