Malicious PDF — malware analysis report

Static analysis result for SHA-256 274330d12e5ab44d…

MALICIOUS

PDF

105.9 KB Created: 2021-07-05 17:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a859ae24e453d281859283743be8df47 SHA-1: 69a7d5f7fe73f9660eccd9b4f435a4d72628d9a2 SHA-256: 274330d12e5ab44dd1c47af64a4a41b095b57586d458208e43f7baf80462d969
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting multiple URLs that point to other PDF files hosted on compromised websites, likely as part of a phishing or malware distribution scheme. The presence of numerous links to potentially compromised CMS upload directories suggests an attempt to leverage these sites for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/53f3610f88d1ed441bc717c00cc1753b/sopemuwowajarupe.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090df5c10c15---rixefobiraduvevu.pdf
    • http://matsonconstruction.net/userfiles/file/vixak.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/325905bd2939b5e0d4dd20d27fecd551/27643646667.pdf
    • http://elcampoeco.org/FCKeditor/file/84987234338.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16089137672f53---47457097391.pdf
    • http://chi-kara.net/userfiles/file/20389911476.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/psrto2segpthdu31edhmrfl4a4/kolevapolaboxap.pdf
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/mefib.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffe3c3e64f---rajaboren.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2eb13cbc3f---51513912835.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/6qa9enb7v9dtkuqeoun31rivv7/natiwenigusoremoj.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/kilam.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdce0b02db7---66258369460.pdf
    • https://bojovicsirogojno.com//files/totijukamiredegulel.pdf
    • https://babamore.com/upload/ckfinder_temp/files/20210612080927.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/p14fd9vo2c5dj64slumdfr8ne6/1154404976.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f51d7f0bf---vewufifomapivinazuve.pdf
    • https://examonline.org/examonline/userfiles/file/31443506181.pdf
    • http://china-miyaco.com/img/file/2021621221351.pdf
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/59254340717.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/0cc04e23f9638f6196d3967202b995db/tigixukum.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/h5l7cm9cdiaa1htq8fo30elkf6/ronotazesutanokexewaxixo.pdf
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/s5l73artabmc8agestmohn3eh5/62289541173.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=translate+direct+to+indirect+speech
    • 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_off00012b27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B27 16792 bytes
font_01_sfnt_off00014339.bin
f3b0dd04d9287acb7f9589dda497edceb849c695ba69bdd4604006555b0ba4cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x14339 26584 bytes
font_02_sfnt_off0001826a.bin
c14bf7eceb83c3fd071dc9d62387ca2489f9e0dd46aaf6afa0034771a838c6f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1826A 10576 bytes