Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34eb381832497c1…

MALICIOUS

PDF

90.9 KB Created: 2021-07-23 07:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a6f6473cbb74b802fb686bc7ca17ca24 SHA-1: 3e172c815388d543f3eeb636ba5133236f5f2a77 SHA-256: c34eb381832497c15e5ca4fbcc121300dcfcfd76b2a616faa9aeb19775b7de00
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms and disposable domains, indicating a link farm or phishing lure. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing trojan. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking direct user-facing content but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/logavatavipip.pdf In PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f98516f461---zatuxidir.pdfIn PDF document text
    • http://elm3rad.com/file/jojivitog.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1fcf0c8dad---27312229201.pdfIn PDF document text
    • http://promador.pl/userfiles/file/64262036135.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/xejip.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/72220024453.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9db6d67a85---digosuzeturonolulufopa.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/nigamidejozixaxusedab.pdfIn PDF document text
    • https://777mto.com/contents//files/lovobuzitebesat.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/f4mvhsqo8u0rjjhnn6cd9vfqf4/sokifekabadozodojuja.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/7da20af7847ec7ea88e97e715c5c0239/waxubixawegegujafakuji.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/mudor.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/sotosudagukesavus.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d46cfd9015---kebug.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce25cd727---fanajanin.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/eb74eb249e80111ce6cc83cb7c9b1f15/85240985307.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/6ad739a7265752cf49cf7c0aec5b6b2d/zibelutidox.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081060cc573a---bibupufat.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079708ba0b0b---xokomogobabebiminalivalon.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/gizebogu.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/7457093c3ea46ba5f50e5b39f8a34bc4/feviliwopexuj.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870c4c1e681---65350478253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=short+poem+about+rain+in+englishPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/9f8c88d531cb367f330a528f6229a065/dixazajepetiperibumujinos.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_off0001001c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001C 11016 bytes
SHA-256: 73d9aa104a425aa8858c775c9d6c831f6052816195770d95864a45434e7be23b
font_01_sfnt_off0001194b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194B 17180 bytes
SHA-256: 19025c4b0daaababa423f350e19c2685ca5dcd9591c9893c83aad1267cb668f7
font_02_sfnt_off0001460a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1460A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.