Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2fd759a30e797c…

MALICIOUS

PDF

85.2 KB Created: 2021-09-17 15:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c70d1b6c488fa217b5e32665beb1808f SHA-1: 889fef2a2bad93231fe83cfcfdb8ad584db484c5 SHA-256: 3f2fd759a30e797c0d2e168af21ddaec43e3173ae1547df01c1a7c800066dbd8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF containing numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a 'download' button heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=s9+plus+rom PDF link annotation
    • https://elger.cz/fckphotos/file/zazugad.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/5c802d89297f7e1b5eefcbfcccfc0658/27513765111.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/poriwevoxemogis.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/xidevexoranub.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/39985154910.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/42762452342.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/jukuxidiruxa.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141903799edc---dumixexa.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/80065835537.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/98761556024.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614254064d2ad---29808969883.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/42440541492.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/79048231322.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/gojogadekokagezepitorures.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/vijidaxaw.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/jovelinozis.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/90315454320.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/21799810964.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d898a1ea1---79594607806.pdfIn PDF document text
    • http://checopharma.com/upload/files/bilonilotebosixefojal.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/tatoloduzapojokedag.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/webebovesojovozoruwaves.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/kamixonuxewokivugila.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_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 18028 bytes
SHA-256: 2dfd21b5aa073d4e3f5ef30c8e6a45295302e7888d9f8302a50e9507492d13d9
font_01_sfnt_off000118a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C0 10168 bytes
SHA-256: 71d6810f2b54610b95acc697b2f855c41b70696e3aacc24efe87cbd3327d0603

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