Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a07634f700aa865…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 05:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9dc257313df8b8cd0da21915dae46c5d SHA-1: 18df0674a90b8d1ff2bd28805fe397d07e7a56e4 SHA-256: 9a07634f700aa865f08f926e7fdc9c75a69cf76af24d1724db0e8cf4c7fe75e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan-like behavior. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm or distribution mechanism for further malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=mp+police+exam+paper+2017+pdf PDF link annotation
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9db5eada9---bizugulu.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/7355968784.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/nazavupotirogizanarav.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/nuwekakineduporikax.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/vimagubavewer.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/jeroladorudenadijat.pdfIn PDF document text
    • http://farashimirooz.com/files/rifopisazigirakosijakixiz.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3b089e1fce5c0bba38feb0b05e1ce607/fetarubovolaxapudijujujuk.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/e04061k16grf4imqr41cths1e1/82488680647.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/a88hub0hl8ons12kpj72q6hgsr/rolunaxife.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jukujuxevolatimitedawob.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084961c09b87---10626954911.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16077b30aa8c5d---vosarasovuzalanifawuv.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52be418b6---lazisuvenuki.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/sesozugivegilururuba.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/9bed8c7565d605be775c18be3cfaa7e3/24580038233.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/u2opoh1gs94o7j59cnn2mcsd5g/mexijopizijewitakurugaj.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/41115913861.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5c81c0588524775cec982a41a0beebda/24050009596.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702e843ae34---65944875643.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8438b3ae4---jumebajinivopatufef.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/80109612999.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_off0000d901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD901 20716 bytes
SHA-256: b67642fa0c7f125f4e8f78bd168928c023a55c58a13e11342691493796ead688
font_01_sfnt_off00010fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127ED 10848 bytes
SHA-256: 3fd3e7b4e847884826b5de0f91354137c00e740e0e22d1bb7b952c8e02022833

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