Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c5c3710740d7cf…

MALICIOUS

PDF

130.6 KB Created: 2021-07-08 09:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 20ac3817105d11d4c0e0f6f9a639e641 SHA-1: 8af45a1f8b2240814f92aa98660a4b7faebd9c3b SHA-256: 75c5c3710740d7cf61a6404287909d489f1ed6808e24ecfe5e5073f27806c17f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, indicating an attempt to lure users to malicious content. The document body is unreadable, but the heuristics strongly suggest a phishing or malware distribution scheme.

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://atcotourismtravel.com/userfiles/file/belaxakulodudamarujigevo.pdf In PDF document text
    • http://thekitchendesignstudio.org/uploads/files/10885491838.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/bodiv.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/wikenejavibijulabifewix.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/penilowip.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/51376276506.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/hhfrfi18og73l2ce22vrrseek7/ruwososejukujik.pdfIn PDF document text
    • http://24cvety.ru/upload/files/mizivaxewajekuvewekamik.pdfIn PDF document text
    • https://ekransamara.ru/files/xerapixojuvunexelav.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607734485bc62---15908151683.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/bekitisosunetujabo.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c547dba409f4c11c5a2fd6da381e9d4d/69630652466.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/zokageboxovi.pdfIn PDF document text
    • http://renovator.cz/files/file/29307258215.pdfIn PDF document text
    • http://envigest.cz/upload/file/27605302365.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/qmpis3k6k9aal2hlq8rqrni67d/45671560287.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/28826899648.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/53002577791.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072189f1cc58---xoxevuvepegezuxenatiwujop.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/46384639471.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/rhgogo0048mmo31kaf0n58cms2/rikafezexatikuba.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a073a61639f5b00421e962fc584ffc00/samilajefirudobumakop.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e049ce11b733ee5c6e7296d83c70448/lelezov.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ba8241f2e---bumotivemaxeseduje.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9044a1d4b---45419619780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=hnd+in+english+literature+notesPDF link annotation
    • 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_off00019f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B75D 10620 bytes
SHA-256: 8742d09a6dd428289e33b83859e41d8d42d9a5bf51a7dbab06a36c21c76c4f07
font_02_sfnt_off0001cf4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF4D 17300 bytes
SHA-256: d1d0494e9e3e9930adabec680e9c812a20dcfa3aaa3b0a4f6a85d3532cc01889