Malicious PDF — malware analysis report

Static analysis result for SHA-256 037ea74d355806e6…

MALICIOUS

PDF

80.5 KB Created: 2021-10-07 07:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 87bb6262ef463e52bad30ea8286d8bdd SHA-1: 7310de9fbc396e1d51c7596a72e2d0cd1ea2c187 SHA-256: 037ea74d355806e68de1c19913cbc7bb4282d65a389c1a4ae13610156657efbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms or appear to be disposable. The PDF structure itself is unusual, suggesting it may be an attempt to obscure its true purpose or exploit PDF parsing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=conjuring+3+full+movie+download+in+tamil+isaimini PDF link annotation
    • https://hatinhjobs.com/upload/files/tedagipetugevogog.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/27895623446.pdfIn PDF document text
    • http://tabletopad.com/images/file/jorukidiguwuwegug.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/ladozusimelafugelerof.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/42546043082.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/65246850388.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/47624360c023067e651cd2067d664e42/witevasolujovedadegasalal.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/60781537252.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/zokugegonogitizelogod.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/7192945205.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/19307089425.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/73482842222.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210916_101753_199.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/94441392791.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/14681678702.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144978fc659c---92791919850.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/busidetozigan.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1615de38722e05---jakedazi.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/bizuxemudutunum.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/89304802241.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/53499447925.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/laliritizojilat.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/zunolatof.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/9278e2e1b376960a2dc41c1ac9a769dd/balamunimoxidewati.pdfIn PDF document text
    • http://generoussecurity.com/uploads/44295527269.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_off0000d319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD319 17848 bytes
SHA-256: df9ea379281aa9425de0e2734e7b981af4c0e2da1a832afa38c0816c3587e311
font_01_sfnt_off0001010b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010B 11280 bytes
SHA-256: 5eb91f1980eeb95de2784941eb3c9b9f73c4c1fd8751df0dbd9fa0c91ff01535
font_02_sfnt_off00011b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1