Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c5b7cb2871b4fe…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 01:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9dcc89dca0678c4f252d8ad030012d19 SHA-1: e5e5401d8da2d4c42216caeeb62a072836aefe9f SHA-256: a9c5b7cb2871b4fe1efadc6ba5ba32e6798c6d2583a5a7600d7400feabd9099a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The primary function appears to be acting as a link farm, directing users to potentially malicious content hosted on these external sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://archism.ru/uplcv?utm_term=sherlock+holmes+in+bengali+pdf+free+download PDF link annotation
    • https://mt-creativestudio.com/ckfinder/userfiles/files/fefamufuterovezegoduk.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/titelodobupeme.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c7952d61dc6afb6ee754aea3d80082d9/kejufefarawelebexuwajazu.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/venaxutugi.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/a631124807821a7e9c4c9aa63cef5371/mimusuwepaxexavusex.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c51f9c28bf---34097793910.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xogibarenupomipusajaved.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/vilimupavugi.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/667198d43ccb35e666533813fc0d832d/mijavutasob.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/8d5c45db8ce55a8fd3529d5b66b5c541/mavedafolafezigurebafijof.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/67014447231.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/b93305b1e2e32445a74dd725a7cac043/pulapu.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/pajiziguzaxofulidaxov.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/97945005316.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/50aac7f732b1778f8a7d2e98e2d2757d/41645059.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/k7krjmlvcpvhs10br9cp6bh9hl/12407422735.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1b2d7b098---70759465373.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc9cf861c8---27917714027.pdfIn PDF document text
    • http://prestopc.it/upload/file/luwavaw.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608800e7762c2---55138540035.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/cadf4dce8dfe05771481d45f1f7951e4/56190873597.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/50li0q727e3rja7qflitgv5837/ketexavafitemu.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/4521496835.pdfIn PDF document text
    • https://irantruck.ir/data/file/ravenelivukeze.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/90947835911.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_off0000d9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 17644 bytes
SHA-256: f73470a0019c2e49fdd1856a7d15dc5118ea5fb416a1677b9d937fdddf8b3463
font_01_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 11360 bytes
SHA-256: 14e09fa32745fcfdaa7c804361c7d2ccc3575a2be3ca5109c6a819faa50eee6e
font_02_sfnt_off00012194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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