Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2e1ebf4d77c984…

MALICIOUS

PDF

90.2 KB Created: 2021-07-09 15:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 356f89a4d4089c3bf52743219a4b1dc5 SHA-1: 07d2f4309df8c667e14b690433fa528306f82645 SHA-256: bf2e1ebf4d77c98482a5fe26e6a68d2d13e9f1d9adc681752b94430e751e8749
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised content management systems or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=what+makes+you+unique+job+interview+answers PDF link annotation
    • https://calmoinc.com/upload/editor/file/mufamofuwafuxexetelugota.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/37360862440.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/4ee5660be449a2623fffefb841b0dcbd/xovulumazubolokow.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bba72cc02---vupujorulowigapip.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/9d6c12e3c662e19bb3b31ae4b21df302/89128868746.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084d5395ee34---xovusulubekatezem.pdfIn PDF document text
    • http://flexa.cz/docs/file/karepig.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b44b36af0b1---6909317565.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/zajomavetiwer.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071b95d58b1b---sujatigeresalepoweg.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/sedipuxufexugejosisap.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/007b7a9f0a822ae29e1cb36498e4a7e5/lifux.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bae04b5599---sosakemuxilibujobuja.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085eacab1293---59433792679.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/tevezusudevawomaroxivef.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bb58fe7c610---49773815176.pdfIn PDF document text
    • http://amandamaitland.com/images/file/47495336581.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/vawaravasigonob.pdfIn PDF document text
    • https://animaliadielisa.com/file/nonogarafixeb.pdfIn PDF document text
    • http://healthywithhart.com/res/file/8359888873.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/10f1ef669fe41e9cf3b414960ff09999/dafuf.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e02277725---48290808891.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_off0000fd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AB 16804 bytes
SHA-256: 104864239b3295bebb14a719aa886d947f33895e280bfe53225eae44463a8fcc
font_02_sfnt_off00014173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14173 11192 bytes
SHA-256: 7d2089c296d0daaf2fd93e5db296d93c878f6c1a0fb56edc76938ee744920ffb

Open this report in the interactive analyzer, or submit your own file for analysis.