Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c08418c7ca6e834…

MALICIOUS

PDF

90.8 KB Created: 2021-07-20 19:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4735c95e907fe347d5f665af20e73a2b SHA-1: 8f76c30f2cf9df9e7503907108fc45a1a6c8c011 SHA-256: 6c08418c7ca6e834aca3fad4b6fbe16fc52f1a1e08c642e67070821f247c500c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alliance-ic.ru/uploads/file/pozasepuzinejovug.pdf In PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/ee71756f5ba3885fe0eddc6f7892f6ee/3237477742.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/suxez.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160734d9dabf9f---nofobi.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/36ps5euh8uk9oblj640980efj2/18212463369.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0ad4552ce---9734446521.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/rv0uqvvnr5rtdkoj7lv24gtkm1/fetupuzojerejazimo.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/9894bcecbbb439622a0dddaf921c3310/zugevijeregabuwofado.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607eddef2fe00---zupikemurekomuzupogi.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/n96f463hmiomp8cecbocqbop9e/molufizitaranunomonad.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/62876147508.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/55ossusui05l0of1ploejjbg93/57889837961.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/bagesilipugigowakowuto.pdfIn PDF document text
    • https://go2germany.ru/files/file/nuxefuduzej.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/gijijububozatamima.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/rigodazejisaxujezelo.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/lipusokirugufifivupedika.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b05bb78db8b---sizusajadiluvafifuvifoze.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/aiqjbkrjssme54n3oq8pgmu2c9/nujowon.pdfIn PDF document text
    • https://activepymes.com/pub/file/15227664773.pdfIn PDF document text
    • http://holzweiss.at/76306913140.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/fasojugunesux.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16075bee31d065---tejuxilevumatolesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=signs+and+symptoms+of+depression+and+anxietyPDF 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_off0000ff77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF77 16992 bytes
SHA-256: c5c7d7c5414f1d29c528bb614f11af3264b08a230139413c1750ac4a3f55e850
font_01_sfnt_off00012c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C02 11088 bytes
SHA-256: be5bffe19ef49d14da0c9828f9b2b2d023bb938f7611fddf32dde084fd76cf22
font_02_sfnt_off000145a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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