Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdeb973ff9d81e0…

MALICIOUS

PDF

76.9 KB Created: 2021-09-21 08:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 74b7edf44b3c395bcf0291d00c08654d SHA-1: ec1193256fa579259b0f01fc3ade0faa356578e3 SHA-256: bfdeb973ff9d81e0c2aa31f51c4c07160b8c09ec6dcf7a150fa80794655df9e5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites, suggesting a phishing or malware distribution scheme. The file's structure and URL patterns indicate it is likely part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=virtua+tennis+download+apk PDF link annotation
    • http://shrlie.com/upload_fck/file/2021-9-16/20210916161325197508.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/9796ba48a2e367668f751ded03d16e46/63094288273.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/lafoxanofukakulekugitosof.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0232f2312---sefelogajevi.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ba6bd16c5---zarowiliwarenegamozavaxu.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/s3a7dcvs8dbm0mbaeg4dm3vuvf/64311683574.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/dogafowajalugatubuwov.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/xokamiliwemewixiwudebewi.pdfIn PDF document text
    • https://oktatas-konyveles.hu/term_extr/files/1963221071.pdfIn PDF document text
    • http://ciatic.saintelserver.com/archivos_editor/file/29961913014.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/lugubeforupidipujexexet.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/xomugiwobezadonidasu.pdfIn PDF document text
    • http://opsir.eu/files/file/63318691822.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/jemugujesovu.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/34672777679.pdfIn PDF document text
    • http://rcmo.ru/upload/files/5076721144.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/firunofodemulijewetufa.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/0a8881716863c94dce009cf5be342012/22666449305.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/57750071228.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/vadubokobulavi.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/30521661591.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/992b713c1491f4c424b56ef7521e8a57/busimiwaxubawemedek.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132b1c906359---bunezitizojuzitaw.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_off0000c714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC714 10632 bytes
SHA-256: 213b48226ac5fe36e8f184017ba4bffc1b3236afa4abbc45099e3bd8543b10b3
font_01_sfnt_off0000df95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A7 17876 bytes
SHA-256: c3c834eb15dc8e75e71c8985d059289d03dce24959dd6735d5d08e4f6d7dd7ec

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