Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab294c2637d12ece…

MALICIOUS

PDF

96.7 KB Created: 2021-08-01 00:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c93e066a248afb120f03667f11fbfbce SHA-1: 01667d03b3b087c603dbf974b028caba36da7ae8 SHA-256: ab294c2637d12ecefc56d4461cb71292fd6baf86dc6bcced135759989d409ac0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://laborke.ru/uplcv?utm_term=managerial+economics+and+business+strategy+solutions+chapter+3 PDF link annotation
    • http://www.hmh.sk/files/articles/file/gexegofopifulisimoro.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/fogupenorijaxateneze.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/pojunor.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/57644151084.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/410a11c6a29f263abc7558f72bc6153b/20827770581.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add527c7479---44260188934.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/kumegemupotoxane.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/e2rjj2uvheigjb8g54a70lbm62/rovufafezepu.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/refoluliniw.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b6529bef0cbb648618e1386241a8a9a2/71389320946.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e35d9f2c38a---rarozokifajilu.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/31917202215.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/rediji.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/perepix.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/223701434414e6cbb31092b559d30d36/19811753219.pdfIn PDF document text
    • https://schmitz.cz/res/file/78400452652.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160862226df312---pelupilof.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/kidirexakevikuz.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/85110776694.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16192363789.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c478c903b---26257761363.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/xerokovegitajabixubejak.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/kmniphkg3ifp4mdgbf4f1fbker/zujunesodizajim.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/gawivukufif.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/3bc0e1fd9cd69794fbd0b5c3ca18a554/13411182315.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_off00010f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F01 11480 bytes
SHA-256: c8cd093fb83fe99b61a9052f44f6f6aabb15aa0050beed330c2f5983dc0b8303
font_01_sfnt_off00012992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12992 18944 bytes
SHA-256: 4d63acf35c1295ffb6970c116734dc4329b2605021b29e62c04f0815a1e27f59
font_02_sfnt_off00015c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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