Malicious PDF — malware analysis report

Static analysis result for SHA-256 a746ef40b8d481ac…

MALICIOUS

PDF

87.1 KB Created: 2021-06-26 21:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd930c5bb1a2e71bca6c7a14c15edf17 SHA-1: 938eab9746680dff7a5824fd0fbdedb62e30137c SHA-256: a746ef40b8d481ac9cd1b3d66d9ef459d7f35276fa1a1e5e36e658f95f4334d7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF identified by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm and employs an advance-fee scam lure, suggesting it aims to trick users with fake lottery winnings or parcel deliveries. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest malicious intent typical of phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/f9pba86pc5f5vcpsf8bha6t6i9/61039984293.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2d6597eed---94628517771.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608120389ce66---98890483322.pdf
    • http://chocoenglish.com/_UploadFile/Images/file/pefasoxepafopijewenu.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/8524aac8b073bac48e4a7e0f91628db4/fizedinurekobeb.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/idfv7us58gotpglfgrb460tem5/62494238566.pdf
    • https://invest.pl/userfiles/file/tudin.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dc3327b6e---97622630357.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607018c32c9e6---kuzedizegarisupifak.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160826b765a7e0---ruwuserexipepuwigalo.pdf
    • http://agendaalzheimer.org/files/galeria/files/10106884772.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160acad61770e6---sugojo.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/92dca500139797047f41235cc9b98c76/sezobunat.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/078fo25ne1uu6255iac1c7hk17/19026318043.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097673c5d419---44983134848.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160840b534cb64---jaluwujit.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/61d96a77a31b5081d8932a4ee4631875/rexuzozaxeripixakavinox.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7836c67be7---tebixutas.pdf
    • http://energy-labels.com/userfiles/file/74875946703.pdf
    • http://wisdomtours.net/upload/file/10333355737.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe8b436b9f---dekorimukejexomuzodemiva.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e578b794b1---89089322374.pdf
    • http://bjhtdszdh.com/v15/Upload/file/202168833242672.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607df9aeb7cc9---mariroxanobirexejajajekix.pdf
    • http://reunionclass.com/clients/7469/File/xojawodabu.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f9087a528---36637384226.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+wrap+text+in+illustrator
    • 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_off0000f391.bin
2d772223b7cf1dce5a7caa7d8474d141c4f76216e170709a78855ee67b516ce8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF391 16632 bytes
font_01_sfnt_off00011e90.bin
e4e8c5c245db88ea68d14875e9bb3cbcd2643e53ae2e927df8ce58b36ad0bc22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E90 10524 bytes
font_02_sfnt_off000136b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136B4 16792 bytes

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