Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7bc8a6733dedd2…

MALICIOUS

PDF

118.9 KB Created: 2021-09-01 09:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 195478dff524b6c40ff4d504e2873146 SHA-1: ac96ec40c917bafe618cf26806cadd894e757b96 SHA-256: 9c7bc8a6733dedd2631503fb0e136be0120993be1a129ada65ae9129cefef8a7
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The embedded URLs and link farm structure suggest an attempt to direct users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://queure.ru/uplcv?utm_term=words+spelled+backwards+and+forwards+the+same+way PDF link annotation
    • http://builderall.info/userfiles/file/31448494080.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/59056620958.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/44934264937.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/kakutesamoxukolapo.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/medixakewibafi.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8c99495f4---femonewalizifopivumama.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/gejedigulitoxa.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/rewozodupiwejuteg.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c86d75f44---xagonani.pdfIn PDF document text
    • http://blueyee.com/upload/file/240209221081.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/naxenek.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/c1549406837804720ef30eb5b7beb1a4/61211228383.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/tarava.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/791101d0cbffc4acd4dead374336f937/47324782036.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/texobukuxupi.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/4979480162.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bec216493e---xedoxaze.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/98308897031.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/suxonofunalaja.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b1ec8becbd060077702799595b1dd3e9/zetegoguxobalavesavami.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/58459647640.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/92875416909.pdfIn PDF document text
    • https://irantruck.ir/data/file/vozedenawajosuzug.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/dusoretizeregi.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/75663517516.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_off000168bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168BC 19460 bytes
SHA-256: e2e7b8e9faf5e2192630b85fc07e1167ff126e381baac084c34de459504184e1
font_01_sfnt_off00019aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2BD 11216 bytes
SHA-256: b3ed7fcd2d6c8a235cfcf91669717209423cf47cec904bcd95d918e84daef795

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