Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b8a00e6b0dc561…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 10:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3dc0404646e15924be7fa6d1c097f1a2 SHA-1: 0d56348e1f772d7f8965e2fa455edaff12ff667b SHA-256: d8b8a00e6b0dc561ce5b764ef559b0533622ad48f6337c1326d52d46fdfd7b17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://baobihungphu.com/media/ftp/file/jenifemedovevukogevet.pdf In PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/zibotixapasowunofadedufa.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/romozojuresodu.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad0a8939c8---sunodajipapilivaz.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a07439c15fd---kidoziwagu.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/xezusaxomidekusaz.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/lemomivolatidovo.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/jolunal.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742a5d095d8---wejupukabajoguganoriwumux.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/63115898516.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/dolatudotof.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89793365ff---wupomibidobu.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/45247964189.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/fekipufosige.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/zoduzofofuzamuzusomen.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/miduzusiviriporejijigodo.pdfIn PDF document text
    • https://marosme.ro/hirek/file/15469560630.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7798fd867e---paluxegidekenuzipipa.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/9vrhk3gbli5c06ff3ohplsfjk7/6597428869.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/2719264235.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/3355573326.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/45855639266.pdfIn PDF document text
    • http://klefmarken.se/upload/file/99481632054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=farnham%27s+freehold+pdfPDF 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_off0000db1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 10584 bytes
SHA-256: 2aed60c8136121bc1602c0714cc4fd35d252bba577e9936bdbb5e6c4e861c024
font_02_sfnt_off00010b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1D 18188 bytes
SHA-256: 900711ac0b3b7248c1336662b8ab5074a8bc1587b3cae6262db319f83edef845

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