Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1059edde93918d…

MALICIOUS

PDF

92.7 KB Created: 2021-07-31 13:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 177f6c3af2eb66f36706580055db0951 SHA-1: f08c23d17ea5281c0b75e260243a5994a904b35b SHA-256: 5a1059edde93918db59432cf1f033048d68a3278e6e2aedff7e380b6084984de
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of an advance-fee scam, including language related to prizes, funds, and courier delivery. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely to redirect users to phishing or scam websites. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nomylo.ru/uplcv?utm_term=how+to+reply+to+a+craigslist+job+ad+examples
    • http://eros-arena.de/eros/userfiles/file/witaboxeduwagotarurib.pdf
    • http://xahscw.com/userfiles/file/49270457733.pdf
    • http://notariocprietoa.com/notaria/documentos/files/xewifasidaline.pdf
    • http://finpacecuador.com/userfiles/file/92875572361.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/11f0a8796103f7236ac1e1614f70e079/mogewivir.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/d0cc71983b67d588975e1362aa5769e3/33565542204.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b782c85d350---jikesobusane.pdf
    • http://cariboohose.com/userfiles/file/45441693719.pdf
    • https://rajakeempat.com/contents//files/83470001158.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/cf7d69c6375cefc0e866de8d3851ea98/neponuzozaduzuw.pdf
    • http://kcntanduc.vn/img_duhoc/files/20259718834.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/givaxifajepixelizijelagon.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/8c8a101842977da71ebdb5b7c2420b48/lepukemubipumijaw.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16093046b614ce---nugoganad.pdf
    • http://clinical-pain.com/pds/userfiles/files/tusitij.pdf
    • https://akproauto.com/nbloom/fckuploads/file/59704641357.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/56d958081a0545fb1801155bd4b02675/79884253054.pdf
    • http://trendybiz.in/usersfiles/file/xejuxarawuxusije.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074d31ee9916---95434364313.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b236af19905---zipakizetajikobazopi.pdf
    • http://biblioteka-belzec.pl/upload/files/20207069443.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f09baf32ce5---bazuwasof.pdf
    • http://ippinnudon.com/uploads/files/96222754154.pdf
    • http://tienhasteel.com/app/webroot/upload/files/derapi.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_off00010414.bin
fbbf84b429f2fe251a69fbc1b58f3509de275f44127327f898f3c4b9359589f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10414 17536 bytes
font_01_sfnt_off000131f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131F3 16792 bytes
font_02_sfnt_off00014a0a.bin
9a7ef2c9eba110605eb76cb276bbce69ce6d96002abb38203e632b6ca4b7600e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0A 11316 bytes