Malicious PDF — malware analysis report

Static analysis result for SHA-256 8506031d6c0c7a3e…

MALICIOUS

PDF

89.5 KB Created: 2021-06-27 18:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07d2383056a4b5ae10911a1d8f390713 SHA-1: 6d7f47aed50e8814feab4c01c9c958f149165bfe SHA-256: 8506031d6c0c7a3e73d7952cda7044c8ff82a9b9dddd65a4c904235bada0f71c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, serving as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and embedded URLs suggest it's designed to lure users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad93968654---gusovuwi.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/pfp1gp7ldig4vnkkjthr028ql8/lavoralenutin.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/84949368099.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/nrpicv8hppr76gl1orhhrdqs59/debipofizododoze.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acffc145287---88529167153.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/csv57246dugdju4aipg40hrpf3/jajirujep.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/d268d175430b56ce48a3607b45296199/33743727241.pdf
    • http://krzysztofmalec.pl/gfx/fck/file/tovirikilerufopufeja.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0f043a607---danunoxom.pdf
    • https://diarch.in/WYSIWYGImage/file/rakukakowitisimovobenu.pdf
    • http://candybeauty.vn/upload/files/28071023893.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/744c6456da76980f1348c09dd8a599f2/gokogovedukatevatetux.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b580cc4fc82---lujagino.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083174a98955---bebepulul.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/80d653975ed7ab3ac8e10c2315730ad3/jumuk.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/13761683973.pdf
    • http://jandebruijn.com/uploadimages/files/bidemorusikezokigu.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/t0qq20h3b0lul8k56mn044sam9/60481328517.pdf
    • http://fredericjean.net/oplusco/file/zifujisatijafatu.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/bm6hrabu1n0bpfi4eq8k4lh6t6/53931469885.pdf
    • http://veterina-hrib.cz/user-uploads/files/zejamete.pdf
    • https://hurghadalife.net/userfiles/files/87665301684.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6c68e68e2---xobozij.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6991c25453273029a58d543c58224625/57583541613.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=questions+on+time+speed+and+distance
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f73a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 16792 bytes
font_01_sfnt_off00010f51.bin
0f61b0c3288db6343797c71447e701c1bd6a0756d72cd957413d19d044ec7de2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F51 10688 bytes
font_02_sfnt_off000127ea.bin
86615c7b057836e86058b1d06af55cd116000938e7f159d3655f7fa90f2a017c
pdf-font-stream PDF embedded font (sfnt) at offset 0x127EA 18264 bytes