Malicious PDF — malware analysis report

Static analysis result for SHA-256 494d8c38476ef91b…

MALICIOUS

PDF

71.1 KB Created: 2021-09-28 01:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e788ecdd063adc5292ae25fbf6027b1 SHA-1: c9630781d8024fd59c7112b1d6619332445c67c3 SHA-256: 494d8c38476ef91b02116e942c4e56cc37d03dc04a05c8951081c1ab2b106728
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to various PDF files hosted on potentially compromised websites, indicating a phishing or scam attempt. The 'SE_CALLBACK_LURE' heuristic specifically identifies a callback phishing or tech-support scam pattern. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely to trick users into contacting malicious actors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • 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.
  • 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://boathousebrokerage.com/userfiles/file/42964643547.pdf In PDF document text
    • http://agecarekorea.com/ckupload/files/4566705001.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/j2amvf2bcfsvil2sf6s3fov2ga/faraponajejofuzedaji.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/90944438567.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109101544122332.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/d948108f3947477ee544210f8b86ab3d/21928334686.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/sawowunikovofer.pdfIn PDF document text
    • http://simonide.org/userfiles/file/wapopubisozofu.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/529641fa7200b111b8e0ac978c662ebf/75936980170.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/nijuwurur.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/ruzejikelavagomukojivamok.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/94350084846.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/kakuzomekejebunixugup.pdfIn PDF document text
    • https://finliz.lt/i/File/kogonukabadofofob.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210906075413_fixg1u.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/56842599944.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/56359346387.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/xutemejifaperekugiluromo.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/nokit.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d7600e448---35988051781.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/riginulonazakidasalarixet.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/12001687809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+get+minecraft+java+edition+on+androidPDF 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_off0000b21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21A 17080 bytes
SHA-256: 2f3ecfad096039a69405f23b1aa86eb360a2b9faed11c8f2c72cf0faeb394be5
font_01_sfnt_off0000dd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 10880 bytes
SHA-256: a8da37f544d6e9b26d00d17589b3330e862f4571611554837550febf6b2b840f

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