Malicious PDF — malware analysis report

Static analysis result for SHA-256 148cd8a889d5a56f…

MALICIOUS

PDF

84.9 KB Created: 2021-06-28 07:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42b6684b575ff072bee80fa2022dfad0 SHA-1: f7e2587944ae0104b5400d0192315689bb8b871a SHA-256: 148cd8a889d5a56f9245701abeeaf15c31e1f814a692ff32b42ae5d1403cad2d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to lure users to malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://archism.ru/uplcv?utm_term=kinetic+theory+of+gases+book+pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b9091a863---xoxowuzekaxegupij.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b35e79616.pdf
    • https://armagedonspedycja.pl/files/file/kimowomewimim.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0321d27232---berijixiwarapovajinu.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/js91fkkicv4n7ohbngmu6snibn/551328047.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/84dd6a45c182b394a249eb25e80b23c6/kafemuxejukimoginiwotema.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160818d8fde7e2---dasogaxekijuvugomo.pdf
    • http://nitexprofi.cz/userfiles/file/zozeteku.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/4f7e78c0877b682aca13aab510576580/5382986849.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2eded4e471---50778704794.pdf
    • http://nfc.soo.jp/file/feresesaninituxojezijad.pdf
    • https://alutat.com/data/file/38023463909.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/sbbtab8mtfj924fp0okvf4qc65/sapewudumusilesawigolu.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d19db1e43---76142273198.pdf
    • https://festival.bg/fckeditorfiles/file/pamotef.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c15b6ce0cac4b652963cfebd2b13b0db/92313315309.pdf
    • https://baxsporthorses.com/userfiles/file/vobuzigavexuxob.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ba03902bd28fceee433155265cbaa6bc/vobotobopebo.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160861b0ea3cc7---53282749585.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/c4d8ea0e102b91464f7d5c103a36a790/melus.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/d1f5ce119084116358e1b35ae1eb2c7c/69436072203.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e89d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 16792 bytes
font_01_sfnt_off000100b4.bin
4d1b1d1ddc35e58b1476440354a1eebc5e051ff6d736810061b7aa04a21361d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x100B4 11192 bytes
font_02_sfnt_off00011a77.bin
b976b5994a2dfc97514fd5ecee7b180f445b68225d50678b483417f0aa301e3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A77 16980 bytes