Malicious PDF — malware analysis report

Static analysis result for SHA-256 953463324e91588c…

MALICIOUS

PDF

76.5 KB Created: 2021-09-01 22:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1203302840566ee169530118ac31e814 SHA-1: 31b410fab243d1cf6f9ba8db3ba51bbd1eb45c72 SHA-256: 953463324e91588c90bfc84c9c9018ba731a8090b16a2d36c61f97a11c600605
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. The presence of external URIs and the nature of the link farm indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://volamtuyetthe.com/userfiles/file/sakufepivodubit.pdf In PDF document text
    • http://abimobiliare.pl/pliki/File/55786827111.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/nipogepolebaxomadegif.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/624b432725febca823c271fa7348b99d/40080949482.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/pivevawaxit.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/6ph6pd3eugjj0bvg5e3tbksdv2/16690144104.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/21108106912.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/muhp27l17iop72ifh21jdmrb8r/moloxi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/k7krjmlvcpvhs10br9cp6bh9hl/12407422735.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/bejimogawijona.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a73ff07c48b---97461506273.pdfIn PDF document text
    • http://whitepurdeespires.com/clients/b/ba/ba703c466af5784ee38134b9d09df413/File/51974290839.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/84820193656.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/63760144711.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1be83d159---zukudorariri.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/fanonukubepudisorin.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/99219080376.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/ziravusidomaragefemojak.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9cd1b9d64---dewonebozubasirid.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba438f6e254---kixurazovaposasusuxa.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/30321765801.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/zenuwumosivemupuromak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=4+letter+words+in+englishPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78A 10432 bytes
SHA-256: 0ca3a4dfcfc369a93d206e5aede8caa862a37eefcd22a6038916bdbe459c607a
font_01_sfnt_off0000def0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 17244 bytes
SHA-256: 84bd8d267256af76523dd53c00499855c74acf8898c31e362e79795bbb4338ca

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