Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1144fd959d205e…

MALICIOUS

PDF

80.7 KB Created: 2021-08-07 19:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 29f8ba4e462ad86d8a1488975ae25fbb SHA-1: 8ee9694e4638fedc4dee96f5fd737036b726db19 SHA-256: fc1144fd959d205e07a3396e3f421be9d2ceb86b57efe2140f30649e63c714b5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the structure and embedded URLs indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/21911018183.pdf In PDF document text
    • http://studioaeditecne.it/userfiles/file/75534535071.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/67934991306.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/3ba5082a37188b5d7438174c07170964/36582808681.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/neluda.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/69af05b1bf744a7a55a50a7c1b24cb4b/19430872127.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfca485fccb---67753525054.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/42274030992.pdfIn PDF document text
    • http://metapolar.hu/tmp/pibezataxazagogesakibir.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0b917660a---61752027242.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/67587088297.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/51b31b130dfaec791f80b782dd36d262/timorefuselevevamuvosi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/xexamalunojiru.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/timudakilevukudi.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/49183785289.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/128e5539bdd8e69552af6652083d6ea1/83636296744.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/72612444793.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/96657279504.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/76393635712.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093a59dc13f7---34155745361.pdfIn PDF document text
    • http://jinohair.com/upload/files/59761169861.pdfIn PDF document text
    • https://12shio2.com/contents//files/76446772358.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/tesamatuz.pdfIn PDF document text
    • http://lhs75.com/clients/46937/File/38755163452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=novela+rafael+orozco+capitulos+completos+onlinePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE41 16788 bytes
SHA-256: 18eeaa0eadc8816c7effc95bc96a918f728ad3a65c301cacf1f13b413cac2b9d
font_01_sfnt_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 10844 bytes
SHA-256: 35066b356c1a47adfced31fd6730b214406af583db6553e39875d08ff12a9b0e
font_03_sfnt_off000119db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DB 17500 bytes
SHA-256: 800c237c47a3761c276f92ecd13f1afc55cc3e8d63454b4618f0fcda1f28fb7c

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