Malicious PDF — malware analysis report

Static analysis result for SHA-256 c01642a0f1b71bde…

MALICIOUS

PDF

54.5 KB Created: 2021-05-06 15:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8165e3d20bd556c1334e6a6268c047a6 SHA-1: 7fd37f3a3ff7b6c47d66fa7519b51c52419e8f68 SHA-256: c01642a0f1b71bde45a49375a42af4616aa6484a91f0d8d48209a3d0222eeacd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The document body, though heavily obfuscated, suggests a lure related to 'Bugdom 1 free mac', indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9541

Heuristics 5

  • 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
  • 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://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/cff36713bb1c748dde7246ef0c12d546/6880514737.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/866d733c906a861d1eb666e72cb3a3a7/losepibubilitifatubaj.pdf
    • https://cgeminfos.ma/upload/file/kagejuk.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/virawaxodowawasipola.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/gij9kspracktih0g17o0osru8f/83111317993.pdf
    • http://garderoba.sk/images/_file/47503054527.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868feabdc58---taxiruwodasavet.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f46f073ae4bf8ebfac0c39c55abfb301/mutovobe.pdf
    • http://activesolutionelectric.com/images/file/76636202698.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16093d1e71b8cf---kabizeralurisan.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/7h01kt1fsnoude0k43g3mp3php/52171210378.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/3gj7p7qrnfpn1no81ii7n9na0b/nomomuvajirevokolife.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7efe6641e---28163101386.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/6b9e015c22539ac28b078c438a0bdc8e/wexetepikuxobaraso.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836bb408ea3---xepuniputugokis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=bugdom+1+free++mac
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4aa.bin
8bf510836e3168fba5b89bb3ae73fc4f0effcc9e9556efa868a17c3b1fac9b9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AA 5232 bytes

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