Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf06f0c7eacd94bb…

MALICIOUS

PDF

69.9 KB Created: 2021-09-21 06:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f77f1605d4412b89f0d649ed18ed11c0 SHA-1: eebc74c39afb118e172fdc650103237835251f0c SHA-256: bf06f0c7eacd94bb314f5ca870be4a8a324c46a6086c8dc960f5f9bf7abe2822
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs, while many are benign, contribute to the overall picture of malicious intent. No scripts were extracted, but the structure and URL patterns suggest a phishing or SEO-based malicious distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://realcomfort.ru/content/upload/file/fopuzimezodafixi.pdf In PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/guruvoz.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/60212368416.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/devuwikovozefumawutir.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/45983619453.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/47925019262.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161493ad736fec---mugufo.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/58534724415.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/mewenofitupidobowed.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/495442a67a26752bec09f32125dcddcf/tapiketotupow.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/40102697634.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143789b85e70---rafikajetegikizuwasi.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e61468df63---bijorux.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614637705620c---zisubodimut.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/19948582796.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/dudunewowilud.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/vivonixofudawu.pdfIn PDF document text
    • http://scsychem.com/upload/files/javikejiletuwuba.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/24047275801.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/vagatizevisofikaxavixasa.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/72848664556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=coolie+no+1+full+movie+download+varun+dhawanPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/22372005324.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_off0000afe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE9 16332 bytes
SHA-256: 33d1bf15df61907499c942a70c87090bc71f9115f2cc01577e6aae716cad134a
font_01_sfnt_off0000d9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 10688 bytes
SHA-256: 8a2509e8e7a0ea62e34790852c379e06ee8b37b0c170f48b53534529999ace50

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