Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c78bf0e178ff909…

MALICIOUS

PDF

117.0 KB Created: 2021-07-21 01:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e25511256f7e6ef4797301a272e659a SHA-1: 0072200afa957f489feb2c9683783e9cdae0b770 SHA-256: 5c78bf0e178ff90996a4a8c6090537061afc7c478c2bc9e6dc3a8abfbf4bc0e8
196 Risk Score

Malware Insights

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

The sample is a PDF document detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of an advance-fee scam. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting a distribution mechanism for malicious content. The document's structure and heuristic firings strongly indicate a phishing lure designed to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d241fc4d7f---81452702291.pdf
    • http://salkim.com/userfiles/file/bumit.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087c71ebf772---tetesemas.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/o87qf538fvjb2opm52njp2c4a0/kotokef.pdf
    • http://hifitness.hu/userfiles/file/baxomitoxuva.pdf
    • http://51-lq.com/userfiles/file///72690930397.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607d85d696efd---99221235572.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084627d27253---bowanijar.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160984520e2629---83234774391.pdf
    • https://mszukam.pl/dat//file/77883380343.pdf
    • http://jucal.es/images/file/teragakudixifi.pdf
    • http://newdimension.su/userfiles/file/92646220647.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/f7d2b439679c2c90a424bc44951d4363/kijasimizanofuz.pdf
    • http://geredekombiservisi.com/userfiles/file/67666224061.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075f696e0cb5---5808167732.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/22c1601b785433b20710ddff66ebda2f/joxofosabunupadapo.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/26j218sfjf9a816jet98cqsf4m/69605951938.pdf
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/xibafabuxe.pdf
    • https://mobilityservices.it/file/suwazorumezi.pdf
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/vepusovononamafa.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pm7nvei7s7rl4q0eejmtuo5d13/38474895589.pdf
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/zisal.pdf
    • http://drivingschool-brno.eu/files/12456686389.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=linux+spi+device+driver+example
    • 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_off00016a26.bin
c935f607d9e22755c3938fdf745237eea93193770f2b97e78136f091470a05d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x16A26 10680 bytes
font_01_sfnt_off00018294.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18294 16792 bytes
font_02_sfnt_off00019aa6.bin
4b50f9f2ec6405f1e53c1821bba111ed309c290d2116f4e29b37f5aeefe6282b
pdf-font-stream PDF embedded font (sfnt) at offset 0x19AA6 17172 bytes