Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5603848dffba63…

MALICIOUS

PDF

104.6 KB Created: 2021-09-03 18:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71b9f0e9887e390fc8515d660787ac16 SHA-1: 9cfd69ff06be226fc63d251393da9f8492e8e057 SHA-256: 4f5603848dffba6334589c0d54c2fe0fd3894de27d8dfda5e150764636c9494c
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains heuristics indicating it's a link farm, with many URLs pointing to compromised websites and disposable hosting, likely to disguise the true destination. The presence of 'invoice' and 'download' lures suggests a social engineering attempt to trick the user into downloading a further payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 9

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://shinies.ru/img/lib/file/89792302448.pdf In PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/bak8vdmmhplnam0p2vb6q52e04/71834941962.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/82749683365.pdfIn PDF document text
    • http://yoron.net/up/files/wusun.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/zuven.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/24586820951.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/lir6193dt47nfdbf2espjuii45/56543989204.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/22224429504.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/e6a98c0d45071c4a46c3fc9e417c009f/wawaxuligesax.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/45658731708.pdfIn PDF document text
    • https://stopserv.ru/files/file/62101715829.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021619141254290.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/73453545630.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4147015c1---mikeneg.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/44296685492.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/98454486655.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/50811895096.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/74112060908.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/gumesu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb9bf76779---26670044764.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/91253900660.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/48594134609.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pan+card+name+correction+form+pdf+2018PDF 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_off00013254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13254 18828 bytes
SHA-256: e93289d4df4dc64212b6c416d620430097ea9c754e2bfae78ae8dab90a4df7ce
font_01_sfnt_off00016302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16302 11068 bytes
SHA-256: f7a93d55f29c04aff6fc2acc150ef03d4b56382caf394fb6344c04e335ce27ac
font_02_sfnt_off00017cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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