Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28fdb289633b21c…

MALICIOUS

PDF

88.5 KB Created: 2021-06-29 01:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cbb271b0e68673ee16f12c97e54c4a4a SHA-1: 84be157258daac277fd0edee2f05a27ad5eb54c3 SHA-256: a28fdb289633b21c9219e6a2fde51224cc254b6ecccd4abd4e8702c22564f0eb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly suggests the document's purpose is to deceive users with fake lottery or parcel delivery schemes to extract money. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=compound+annual+growth+rate+calculator
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/5bhe12hef45f38rv33pomqgvd5/63493521780.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1efbd7d9f8c2c3b0a5218d1f32a69477/31984850481.pdf
    • http://master-sign.ru/ckfinder/userfiles/files/7527140661.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/e5ba7bb8272108446fe69b52d7511d90/70336980165.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a31e015fc4b---91786742527.pdf
    • http://dolphinegypt.net/userfiles/file/neken.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/3gd9crr97odbhodmje8kep62ie/62902388559.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607059bd28f4a---dizemevi.pdf
    • http://dui-antidote.com/images/userfiles/file/3501968520.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c9620f1cf80a3b67d4c9f8e5c79f8db7/tebememadibevibo.pdf
    • http://goldartline.ua/userfiles/file/94429170906.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb94abedb88---27867016098.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608127dcdfe98---bewetakugogalad.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64f51dd887---kanonojetig.pdf
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/53639917230.pdf
    • http://penzionklara.cz/userfiles/file/fasotitatuloxu.pdf
    • http://namjapizza.com/app/webroot/files/jevarametimewevuzodetade.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/360d99a2ad3df4205112bd7882944ce0/sunufuto.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca8ebc239d---tigawulejexaxowugebode.pdf
    • https://a2designbg.com/userfiles/file/52281371891.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/desekovitapuwu.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/f78fb4e1fa935015b901af0d42907623/58487923400.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/7498aa538a1c5d1f9d3bdafbf9593b88/7008151478.pdf
    • http://jrmhandling.nl/upload/file/kariti.pdf
    • 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_off0000f616.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF616 16792 bytes
font_01_sfnt_off00010e28.bin
c76f55f238c5cf46d86f633306cfb321405d9f35f93aa0aaf2674fcb7c6e03cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E28 17272 bytes
font_02_sfnt_off00013b88.bin
2d4c860b05b0eb1ed9a5ea1ab44ae932291f6b2b97912ce8e1414665c8a0250f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B88 10920 bytes