Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe6df16b8f8b51a…

MALICIOUS

PDF

86.4 KB Created: 2021-07-13 21:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 008403005eb70a3851d85ccf5dbb817b SHA-1: 3402c96bcbd32e776121b0fc1778f6abd32bb589 SHA-256: afe6df16b8f8b51ac95e59201cd2cde3e787eb4300d43c9482d2fe91b1e767a9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics as a malicious phishing and advance-fee scam lure. It contains numerous links to disposable hosting and compromised CMS uploads, suggesting an attempt to distribute fraudulent content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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
  • 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 http://shengnabei.com/uploadfile/file///2021071005530010.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/mukud.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/4fb79e6573f396e647d3b8bae1105a1d/14239969711.pdf
    • https://abofahed.com/userfiles/file/28033383249.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/185ffc72ca3011d4714401ae0fae791b/97002961190.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741fcce13ee---94451524631.pdf
    • http://mlsy.cz/images/file/files/74275195100.pdf
    • https://hosvagyok.hu/userfiles/file/44007428639.pdf
    • http://omg.su/upload/File/dajipuviw.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae036123cdc---bepaludixusit.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608409aea5869---5311787037.pdf
    • https://unicon-msk.ru/data/files/vawepobibuja.pdf
    • http://change4best.ru/upload/file/foruwedubebewopovidupak.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb83f2e16d7---75483436586.pdf
    • https://amblamy.ee/upload/file/bumibak.pdf
    • http://17njl.com/userfiles/files/12296629017.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f60fe30dd---xivinumif.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aeeb6e2a0---34305536385.pdf
    • https://bandotrading.com/uploads/file/98411018262.pdf
    • https://dondepodemosir.com/userfiles/file/67087707568.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/obtr58t25r5ev7t6mfhv6s73qb/josexasuri.pdf
    • https://ceral.pl/ceral/pliki/file/10916568551.pdf
    • https://ht-cooling-j3t.com/contents//files/34585199013.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=aed+to+inr+rate+today
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DF 16792 bytes
font_01_sfnt_off0000f1f1.bin
6494cc87968eb5ae92229231dc5ddae9f022e5ab9d34a2091b8dd21c62a6e059
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F1 16960 bytes
font_02_sfnt_off00011e71.bin
1306338ceba698edd1f1f7ce595a639315e4105a2a9157639b7b38023ae76aee
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E71 16496 bytes
font_03_sfnt_off00013575.bin
9104ba383d2b450095e3c1a3ef7b27c928eba96f5b5ee56a3cc4b60a10b882e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x13575 10124 bytes