Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabdcf9916a83e84…

MALICIOUS

PDF

78.9 KB Created: 2021-05-02 07:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a848eb21664508406d22107be61cdf3d SHA-1: 0032f002ed8ac9d1c3abd7de7a5f9b55d9496da3 SHA-256: aabdcf9916a83e84b5bc77eb4b282e14b09d3b841e83be912b83e5ad1acc0f6c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be junk data, further indicating a malicious intent rather than legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/f21059f3cc2fb72f0dc09b61652eb242/21194141754.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/68655f73f4e0cc7e39fdfb5df3e3d020/47887752209.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3446121f9---31432627608.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/bb9a96b032ec470e9e1d258f95a96a2c/46028997655.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160851991028bf---33188519756.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ee73ea295---jorezozuroxufazezibubotaf.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/814d33bc98cf5f396c39a92f6d05a4bd/zopugogoxu.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f30de5676---vakoxuf.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca450a1ff9---xozopifabeja.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/o8ltotdh7o5e60p2dr1ev4v1r3/duxewuvipomuketanigunif.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dddaf3c379---92055400435.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607128df6c47b---39073938215.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/ee45e0c093a1fb6866dca8a93c9e54b9/vimidok.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606f98bf6e4fe---rasivakixexak.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/rj8a4stpsts18apr5prhq9uee6/30378966008.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/7ba354509390da8a6b044b3eddfb345b/najutetonaburelozilat.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/bd222174c539d5556336a263f72d3c94/79277833217.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=flame+test+lab+analysis+questions+answers
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd57.bin
4b8718bc4e9a5dadb8d93fec0c393f21ef788f3c09fb9b59267543eca8ea061f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 5244 bytes
font_01_sfnt_off00010f33.bin
96a074fd289715f582dccbc3db326d2d64c71f9604c65cb4748c0d61f57f6d66
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F33 11464 bytes