Malicious PDF — malware analysis report

Static analysis result for SHA-256 5387abea5a2d7f5c…

MALICIOUS

PDF

85.0 KB Created: 2021-09-08 04:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7c1769427b0c134d8773223d221ceb2 SHA-1: b51345b0755fd20cae778ad395eb8d3c0b14b428 SHA-256: 5387abea5a2d7f5c52fb75ba78afb1e695980474dccbaa34891fcf696ba123b2
196 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with high-confidence heuristics indicating an advance-fee scam lure. The document contains numerous links to external PDFs hosted on various domains, some of which are identified as compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of these links and the scam-lure indicators point towards a phishing or advance-fee fraud attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://maximatrimony.com/ckfinder/userfiles/files/21857168606.pdf
    • http://www.nagsa.es/ckfinder/userfiles/files/56074509633.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607080c6aa8f6---bewubumikabul.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/07msa5ru3a86j2qrjls496gbo5/vikamidigow.pdf
    • http://refpecsbelvaros.hu/kepek/files/woxakojuvixuvesatibaxodi.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54ccaa5345---suvoramoxora.pdf
    • https://www.prshots.com/ckfinder/userfiles/files/pibebinijesarezeponikasu.pdf
    • https://mt-creativestudio.com/ckfinder/userfiles/files/wojifodotuvedetaf.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1852a4a7f---xorulojobutujewetax.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/lhn4cbqulha1p4fvacvachse5g/dopidawabegazigiva.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba7195db19---zanabirefibinupejukej.pdf
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/nazifuxetidadaruloko.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/0315024afe417a081e189dce0a1ccaef/fuwiniv.pdf
    • http://petraifevronii.ru/ckfinder/userfiles/files/zafaxux.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/cd200a59669beea0e6e9d220b4cc8a85/migisogawidutigiwirid.pdf
    • https://sharenkon.com/files/31836374142.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a0baa6ad1ba---8493335655.pdf
    • http://aktifimmo.lu/userfiles/files/posusuforovu.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609122ac36680---28859542779.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/136233bdb6874ac81536b75053f5d0ee/66709563066.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607050087aceb---jifodekajudoz.pdf
    • http://dj-maily.com/uploads/pages/files/toneburufofutaletebafa.pdf
    • http://armanetti.com/images/95498716957.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=gmat+math+sample+questions+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_off0000e4e8.bin
997c50f6c9e06df1c2cc675b970942648f03fca958699565842dea3594e1efb4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 10948 bytes
font_01_sfnt_off0000fde1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE1 16792 bytes
font_02_sfnt_off000115f3.bin
42202a6023b967f03358ea6fd3cbc7a31228bf8c3b1cfdc4914cfd01e404b02f
pdf-font-stream PDF embedded font (sfnt) at offset 0x115F3 18632 bytes