Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7bf460e681aee8f…

MALICIOUS

PDF

103.6 KB Created: 2021-09-10 13:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c527b95366162e78fad4c81e0f90fc4 SHA-1: 505a6b58401f3d445a6d4ac2427c98c103b3e1bb SHA-256: f7bf460e681aee8f7c25cbd38c3c9d244e756fe261550a35a3eba5779c03a6b6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with high-confidence heuristics indicating an advance-fee scam lure. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content. Embedded JavaScript was also detected, likely used to facilitate the redirection or download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aspbae.org/userfiles/file/fitikevavojelopuro.pdf
    • http://hzbaoyan.com/images/upload/File/giwonewavunapudafikelod.pdf
    • http://cmtl.in/uploads/userfiles/file/file/30664104206.pdf
    • https://daquin-ferriere.fr/userfiles/file/29034270713.pdf
    • https://asztromiskolc.hu/ckfinder/userfiles/files/xokasugononebo.pdf
    • https://samudra99.com/contents/files/2240826225.pdf
    • http://zenithmetals.com/files/72407355077.pdf
    • https://laatuwhuisweerstralen.nl/upload/file/koxibuluju.pdf
    • http://gunjanjain.com/app/webroot/js/uploads/files/3721918499.pdf
    • http://www.musicboxpiano.com/contentfiles/57232753994.pdf
    • http://vektorma.ru/uploads/assets/file/jevotujoboduvipematusiwu.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16137f0ea1a342---95936718624.pdf
    • https://mobilieroccasion.fr/uploads/file/linivomur.pdf
    • https://chaletsuenodesol.de/files/10212864654.pdf
    • http://thunderstar.cn/userfiles/file/20210907181204890067149.pdf
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/polurug.pdf
    • https://autosaloncenter.com/uploads/file/65833751231.pdf
    • https://ambient-interier.cz/files/files/75482131957.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613237870dc9b---97346806686.pdf
    • http://qdsenfeng.com/data/files/51443878286.pdf
    • http://rem-proekt.com/f/file/fikokewemaxome.pdf
    • http://fazendasaojudastadeu.net/fotosempresa/files/wonikikavafuleg.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161397803e0836---21496789004.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131d2c5716d1---kefukivedababadugisaje.pdf
    • https://geloracinta.com/contents/files/80777200733.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=super+j+cup+2016
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001173d.bin
aa148abc87404bdf85721475f1c8c7ef9b15790f7d5ab1cf8721886aea1e5924
pdf-font-stream PDF embedded font (sfnt) at offset 0x1173D 10344 bytes
font_01_sfnt_off00012ecb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECB 16792 bytes
font_02_sfnt_off000146dc.bin
64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973
pdf-font-stream PDF embedded font (sfnt) at offset 0x146DC 16060 bytes
font_03_sfnt_off00015bed.bin
a25e012214790069056b85fb76c954ba76dbc1527ded6454557ec490e8bf7177
pdf-font-stream PDF embedded font (sfnt) at offset 0x15BED 20064 bytes