Malicious PDF — malware analysis report

Static analysis result for SHA-256 919f5a21d9b4e9e4…

MALICIOUS

PDF

91.3 KB Created: 2021-06-26 03:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68fd71a16b0ed582020a0127cefb057d SHA-1: bff2d3511f7995a8400df6b6672dadf1a26dddca SHA-256: 919f5a21d9b4e9e4a86d7af461213b970663fce7785633dc4fdb293cce99dcba
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to compromised WordPress sites, indicating a phishing or link farm attack pattern. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious or phishing content. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://inwebjor.ru/uplcv?utm_term=building+a+floating+deck+on+uneven+ground
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8df40392d---9623200294.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/309eb2a1abed76bce02bb709f15ea5eb/77521613190.pdf
    • http://ulrike-mayer.de/userfiles/files/tutofatatokima.pdf
    • http://casaatlantida.com/userfiles/file///lukixuzirugoti.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a06bcceb3d27829746613dfa9da0b733/depinurusagit.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/d71ltn7laikkiv9krfmc23mcf1/11976193820.pdf
    • https://alajuusa.ee/media/contents/file/2146333483.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5dc36f46c28a46e617c4d6f1ff965f83/57252188432.pdf
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/10082076799.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160745a5bcef80---4827303636.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/275dc11f054a63809739becc6a2158cb/nigokizalatigi.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608013bfb451d---77117396609.pdf
    • http://cjandjunemillerfarm.com/clients/75830/File/60653275270.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e92ba723f3---mibet.pdf
    • https://rajatotogroup4.com/contents//files/68835490254.pdf
    • http://lphs-the60s.com/clients/5/5a/5a84a5cabe7f31a06b4bf99f7e1b7ad6/File/21869935432.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7b3d20400---wadabewodudot.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b165adb129f---nexuzeron.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86c72ea8db---fazazix.pdf
    • http://iaestedresden.de/userfiles/file/4353097248.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/c60b29c358f73b929e4f139c471af207/45519801159.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/01036dbb7a44da72a7d0802e1df4fc81/50933128102.pdf
    • http://tano-cable.com/d/files/62027727072.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/kjqg84skk9cgbbqqbv6t0grk14/56155705262.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012bc0.bin
d8f31461618f6ca912d4ce7b44e740d833bf1f95a870f0d48a740446dc6b6462
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12BC0 17132 bytes
font_00_sfnt_off0000e790.bin
35ef1d95e12cb53feb3f461d7e828cec8124e05659d86a439c5f2d4ef6d180ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xE790 10796 bytes
font_01_sfnt_off0001005f.bin
7b3e421642236dd3c6fad8bfebbaab7e9306fbf11ceeb226c082ad4386a8a4c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 16704 bytes
font_03_sfnt_off00014521.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14521 16792 bytes