Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28f9a24531f6c83…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 14:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: afde7cfd795024dafd86dfab8ac16a3d SHA-1: bea96983fa00a3859f86a01b6271d376c1093eaa SHA-256: a28f9a24531f6c83341b0c70f1462c7248e4372ee063d64f2f55f4f89a617b18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially engage in SEO poisoning for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://buildingexpertsdirectory.com/ckfinder/userfiles/files/67962047455.pdf In PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161401b248e653---kemawexo.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/32180944227.pdfIn PDF document text
    • http://nessium.net/userfiles/file/gigaziwagopelabineje.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/11098961386.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/5k951820sk771pnjk1bbtf6to4/23500784200.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/44590290250.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/guvivifejejetiwer.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/kunexufabirem.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/40502915781.pdfIn PDF document text
    • http://fruitsad.pl/images/file/xapexilakelotepokopotu.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/zelugid.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/wedibipulolejutiz.pdfIn PDF document text
    • https://sambelteri.com/contents/files/lakokusijefelexosaxa.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///46384760465.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/i13qvnnlqda0q4l7op0dh39lm8/59621787934.pdfIn PDF document text
    • http://rayanchem.com/d/files/97257308301.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/64143642391.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/54824e9bab6af0490e4b31b9cde67ab3/90752735007.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/nebegagatakugujo.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134642f14231---82141387633.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/38709377419.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/80297631330.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/2662909277.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/72337297313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=henry+stickmin+apkPDF 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_off0000dbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 10564 bytes
SHA-256: 74358782962fa7d6be53cef0ed23b4462b88da4f141ffbb0e0f2488d099301cc
font_02_sfnt_off00010c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1F 19588 bytes
SHA-256: d38f6e9191c51c141c7f86e1fdbdd34b6705d1cd280dc50370e710eeaa8e3472

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