Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1955fbde5b4a53d…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 22:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 458ca3a9a7e61971d4cf23033764a8e8 SHA-1: 053e0951ceacee3402125b11975ce5774a9b4095 SHA-256: a1955fbde5b4a53d9eb54a69008e8de499d2b5120494f48aaf1afd8c777c8c49
196 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it is an advance-fee scam lure. It contains numerous links to external PDFs hosted on potentially compromised or disposable domains, suggesting a phishing or scam campaign. No scripts were extracted, but the document structure and URL patterns are indicative of a phishing attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://seas2010.cienciaevida.pt/site/upload/file/fibapodasipepozifezesoxob.pdf
    • http://ceramvetro.net/userfiles/file/bizemibutuzivepapixisiru.pdf
    • http://mrcubezpieczenia.pl/app/webroot/media/files/joxezopalovuwimizejulem.pdf
    • http://mcutech.net/files/julunemaguvobifoponuzike.pdf
    • https://grouptm2.com/contents/files/40780166241.pdf
    • https://losaltos.com/wysiwygfiles/file/dudamugusi.pdf
    • http://bielle-srl.com/userfiles/files/41445208887.pdf
    • http://pronobile.com/catalog/file/sofetubafebebojevomubusu.pdf
    • http://hysansam.com/fckeditor/userfiles/image/15005327498.pdf
    • http://519pf.com/userfiles/files/mubatizapowo.pdf
    • https://xylemleads.com/userfiles/file/pabiwopawuwudezagufosom.pdf
    • http://studiosantomauro.it/userfiles/files/tatudepas.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135b0c589b71---bapovuxosufapazuvumako.pdf
    • http://rwdwebwebdesign.com/img-aim/files/90683683614.pdf
    • http://namlinhchivietnam.net/userfiles/image/file/49066573756.pdf
    • http://vinacafe-dalat.com/Images_upload/files/dijoz.pdf
    • http://punaide.com/userfiles/files/bajunazupixisuvujumew.pdf
    • https://webtechnocrats.com/upload/file/14600048872.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e295158f59---54952993598.pdf
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/90832625047.pdf
    • http://dietgame.net/admin/fckeditor/data/file/20210916150324.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f5b1a67e3ca9d776d08d31fe4384526f/jebugamekurugekikagir.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+copy+music+from+itunes+to+android+phone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e002.bin
121fb127a918a3f9a195c0c12ebd913ecdcb0c82852e1e37dc0050a5b3945288
pdf-font-stream PDF embedded font (sfnt) at offset 0xE002 17832 bytes
font_01_sfnt_off00010eb4.bin
6be288f89bd9e59c3b66962a625891e08d44f0de0a0e005663cd40cae52c53d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB4 11132 bytes
font_02_sfnt_off00012886.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12886 16792 bytes