Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7912747bb1d770…

MALICIOUS

PDF

86.9 KB Created: 2021-07-07 20:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 063988136b7b14de0f670fd8b4b524d9 SHA-1: 7e712273b882a9822cb40536c429c605dd3184c5 SHA-256: 2b7912747bb1d770d16b96daab92cc46bb7dac0432611979c651e8f0d5e65146
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://infrive.ru/uplcv?utm_term=related+words+for+mother PDF link annotation
    • http://agendaalzheimer.org/files/galeria/files/xogoxefamugejozarukasal.pdfIn PDF document text
    • https://aashianarealty.com/file/84665706386.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df16dd69f29---finokosodapeponurazuv.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fdd72e4ab---tisavimadajivumesonodabu.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/l3h8krksv6v0tpj3t36v8pul61/16716807011.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/dupowuzitibesej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f7b104819---xeviz.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/2c06e904fd6896057c2fa13e8b9af6bc/74260377252.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/6ab03dm73fpp32n8hd91f6jsk0/vukelaxuloda.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/zesumivif.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1cacedf1a---nuzarukipolataritafo.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c1cf087e7---tojofipedusuwekutotiz.pdfIn PDF document text
    • http://giustofiori.it/file/28576319584.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/bf652ddd8d368499502a118ef851f63f/33984646613.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d877f09214878777854606466b728d35/miwuzigosi.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fde93f4c2---39056526875.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d83999c71c---85601528698.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16078e027ba20e---vuxalugusanivaveros.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609845313240a---gotiwadolidisibawubonu.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/zavikojekovigulininov.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/63382493441.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083e01516328---11742336290.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/josiwopoba.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210604_F6761B775E325E5B.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d6fc3873d---gubifinojidaguguropuxu.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085be01a5b79---bubozonexil.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_off0000f140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 17384 bytes
SHA-256: 56bfa7aeb9de6fa7496affb4a13b3aec7b655b9388a9d59b0257ab2f473bbe10
font_01_sfnt_off00011e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4C 10552 bytes
SHA-256: e46ec4a016d82a327946df2464a0d7fab202d2626fe8b2441aa54db0984bbbf5
font_02_sfnt_off00013677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1