Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5bff47c3c5871d…

MALICIOUS

PDF

79.4 KB Created: 2021-08-09 19:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 05b9eaa73e046b7cc9af902237fa1182 SHA-1: fb6d0dc6bcf6f6aade1dfde1fa29c13ac4c4173c SHA-256: 3e5bff47c3c5871d5cb197a2ad14a108ecb3b36331cf72511afadb235af03add
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous URLs, including those with 'utm_term' parameters, suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pixomot.ru/uplcv?utm_term=how+do+i+listen+to+voicemail+on+panasonic+phone PDF link annotation
    • http://alexlunacoach.com/img/editor/file/minar.pdfIn PDF document text
    • http://ubest.ru/images/file/49784650771.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608041acefd5f---vibagexuwafad.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/kokoluxulanijipop.pdfIn PDF document text
    • http://land89.com/ckupload/files/52367999491.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbf8f41327---bovikarutulupidawo.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/81272788630.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/86836865200.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/38327440189.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/52330709509.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/93728999002.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/6a06bbb5412be7d8a2b71cac678e07a5/96990831267.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609520480b9ca---merotosaseruvovonaja.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/jnl35ardh0e2f672bsqsi01aqt/11453879426.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/cacd86ecf88b196fd040bae69b8eed31/nuvujixazuxu.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/bemubinegoporov.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/fegewakosipinudo.pdfIn PDF document text
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/xujelibigorilevu.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/87556396468.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc34fb77e1---76357485711.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/451cea781a6f1d9114c4afdcde06a6c1/40756709415.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/29570902583.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/wuderabekeguje.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/93506188626.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD160 10824 bytes
SHA-256: 1fef366814722578647b4a4e855e3c026c076cc88186dd92861a0692d2bd17ff
font_01_sfnt_off0000ea22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA22 17120 bytes
SHA-256: 7482731a4e2c0176b0d0aa2758252492d56762be7869bf63d52da00fa939e759
font_02_sfnt_off000116f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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