Malicious PDF — malware analysis report

Static analysis result for SHA-256 987dd62fd9a86bcf…

MALICIOUS

PDF

105.6 KB Created: 2021-09-02 17:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62f09ed0382e02a6c749392422dae5d2 SHA-1: fe422d6e6432f8639d8b5beb70f91fd022fac4ac SHA-256: 987dd62fd9a86bcf1b331ca2ca1e39c89c7afd787549e6187a5c0f6e40366a3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's likely a lure document rather than containing direct executable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://rocksoliddesigns.biz/userfiles/file/lidozi.pdf
    • http://ajivikafinance.com/userfiles/file/kusimuparotekowalefebopo.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/0db7277380e5d833b705e619e65f522d/25864689220.pdf
    • http://year-c.com/upload_fck/file/2021-8-7/20210807173212465031.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/doboj.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/29ik00nfcsbltppmnh6enoiisr/52785711773.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c1e0c09ed---48308499144.pdf
    • https://weeb.nu/userfiles/file/66710737927.pdf
    • https://yenhuy.vn/upload/files/71193288826.pdf
    • http://reelproductionshd.com/userfiles/file/kadeperimikepiwa.pdf
    • https://mm-podium.ro/userfiles/file/remon.pdf
    • http://martom24.pl/martom/userfiles/file/porededasiguwej.pdf
    • http://www.hgbehringer.de/img/files/files/39466464474.pdf
    • https://bosgo.mn/uploads/files/54136888802.pdf
    • http://hrzservices.com/uploadfiles/file/lilomuzaxoratukesov.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/430b856845292cfffec935cc8258e5cf/15090566198.pdf
    • https://esterkins.de/ckfinder/userfiles/files/xuvetinu.pdf
    • https://communeouchamps.fr/userfiles/file/legupiropa.pdf
    • http://meble-tk.pl/userfiles/file/tazimutadalibagam.pdf
    • http://smartpaintingplus.com/userfiles/files/wesutopoxiza.pdf
    • http://autoscuolecasetta.it/userfiles/files/49475329728.pdf
    • https://nhorizontours.com/userfiles/files/tovipikasubowumasa.pdf
    • http://www.jindatunnel.com/up_files/file/2235951505.pdf
    • http://anthonyvienna.com/sites/default/files/file/rezokilisudivoguripobinim.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/849e01e87720668579633967674f8413/tubijeka.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ca341c21eb---subulefuwixovasuvemuminem.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=2002+subaru+outback+service+manual+download+free
    • 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_off000133cf.bin
cd2dd83637f5b1dd084f0271d600d3481ef5b779eed7b832c3d30756181e94b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133CF 11268 bytes
font_01_sfnt_off00014e5c.bin
955710679ecfc8ac398ed70337ad16b6bdf74f91a6620121820bf1f0b94c8f4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E5C 18940 bytes
font_02_sfnt_off00017fcd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17FCD 16792 bytes