Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a33f772e71af4fb…

MALICIOUS

PDF

93.4 KB Created: 2021-09-06 03:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb4ec0657c248faab6b8efbdb11cd759 SHA-1: f66f450674ee8589ae8b76a08602be5020daddf4 SHA-256: 8a33f772e71af4fbaa006d6b95e6cd95aaef2534ab6a6ca2a0806f27a84a3476
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicative of a link farm used to distribute malicious content. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly suggests the document's purpose is to trick users with fake prizes or delivery notifications. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://refah4ter.info/basefile/hotelrefah4terir/files/82310889909.pdf
    • https://psihodesk.ro/ckfinder/userfiles/files/tunopigu.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8ca08cdea7---nisikagegabajaburumeto.pdf
    • http://kasystemofkarate.com/clients/861259/File/zikobutojadawid.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160eca3006b5a0---75769321739.pdf
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/75902330675.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/auc21n3lr9h6r2ph2binfibgj4/25540006121.pdf
    • https://gsm.company/ckfinder/userfiles/files/lizaxuvebelenulumavew.pdf
    • http://gioiacompany.net/images/upload/file/13990587056.pdf
    • http://fsnmmaterials.com/UPFILE/userfiles/files/tazevanizuxibumalorefa.pdf
    • http://yasaitogo.com/uploads/files/jutibudejoxoz.pdf
    • https://www.hkha.com.hk/ckfinder/userfiles/files/7362904260.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c253397652e---wikujosu.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/55303817223.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe00f6d6bb---valusasufus.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a036e303173---fojoberozejodafularaget.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/4vjv92hv0r651ga4gudpkeafka/pukifibunituruka.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/a0fd0fc6777596ecc6b33432ad4a7968/94851747678.pdf
    • https://uleiuri.ro/userfiles/file/43189906872.pdf
    • https://onecre.com/images/content/files/51584483036.pdf
    • http://raczcsalad.hu/files/sesena.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=evaluating+algebraic+equations+worksheets
    • 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_off000104d6.bin
49cb3a6a28e5d0473e8b2397c6fef954c11a4ffaca4f49233e4ee3e1ee69aab6
pdf-font-stream PDF embedded font (sfnt) at offset 0x104D6 18860 bytes
font_01_sfnt_off00013630.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13630 16792 bytes
font_02_sfnt_off00014e47.bin
13db16cd01a5696bd7adaaeeb3392b82ae634b61665c0e829c42914cc91afdea
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E47 11120 bytes