Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92eb6dc0da91ef5…

MALICIOUS

PDF

90.3 KB Created: 2021-07-01 10:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19763ce03639e8660012ebd8ae3c4d76 SHA-1: 74ea18a13470e2a1a3ec0564462ed5f8fd89e43e SHA-256: f92eb6dc0da91ef5bad45e2bf52c0c46b3d350bc3291010d4cb35d228ce21b0d
196 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of an advance-fee scam. It contains numerous links to external PDF files hosted on compromised or disposable domains, likely serving as a lure to facilitate the scam. The document body was unreadable due to encoding issues, but the heuristics strongly indicate a phishing or fraud attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab481a68596---65954560964.pdf
    • https://hchoanglong.vn/userfiles/file/dufulejeremifemabad.pdf
    • http://axwelindia.com/uploads/32606138961.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ea78317df7802dce983f9113fa2e1b9d/zovirekeded.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdde9063fc---18368382092.pdf
    • https://an-professional.ru/img/files/file/89319631772.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/phaq8lslk4deekb4cr2hkqbpdn/dabuwebanek.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/7dsefk66nqppmsff2kkpp1oak7/fagamebapavipipuwex.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/f94d0f6b4b8c6f1fa1b73942a613dae3/75667706520.pdf
    • https://palcev.ru/userfiles/file/mogukatiriwifimogitabepe.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b74c8e45e27---zemome.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b79e9fe0d98---96838418198.pdf
    • https://feniks9.ru/ckfinder/userfiles/files/jusadubowenita.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-5-16/20210516114611813074.pdf
    • http://myphammonly.com/luutru/files/vepafuzeju.pdf
    • http://aitrans.cn/UploadFile/file/F1202106282146009716.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53bf36d7f6---5217461218.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c601db3d3---89994297890.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160842a9945a98---rakejagomuj.pdf
    • http://ezibra.pl/upload//file/60598354264.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a480cce1633---riragodozemozuzozawig.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b1f48a7c4---zogopetufiropaniletu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=best+martial+arts+in+anime
    • 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_off0000fead.bin
e94a9dce650bb62b7c863fd39810182ed0684edf387dcb8532167642984e0640
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAD 10204 bytes
font_01_sfnt_off00011580.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11580 16792 bytes
font_02_sfnt_off00012d92.bin
f7580b4696448cb2e788844f6074e450b6e2e3ba5bc86a5302f58e1744c21813
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D92 17560 bytes