Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e58ac2c5d1db185…

MALICIOUS

PDF

63.7 KB Created: 2021-05-16 07:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce1ee79f6cb31490b4f7fa998a171347 SHA-1: 01e5b3b7b89947b2eb6af58ae06d937816daa4d9 SHA-256: 8e58ac2c5d1db18573c2f8d64398eaecb0c26d0a2316ec268b22919edf8cdf54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/gfq6306lp6b7r6usquboc7bo32/10382139917.pdf
    • http://alituncer.com/userfiles/file/lemovero.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fc567dd6e---60270746273.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/aa57b8c312ecfc521e460aef585818db/kanetimaguguw.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/44242394192.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073023b832fa---75171525079.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c436060bf---rebamepedobimeki.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/824fe6d5518884c91a0f1e5c514f3aa9/53985785870.pdf
    • http://www.ecvbrass.ch/user/web/file/58438355580.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/qoj9eus3he3ahvbi6ehig1hhm0/zokirulemarudonorewadaxel.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d41a1cdee0---8078772420.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/71790739c02d601ee1cf68ec9378f2ae/lolunimu.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/961481ccccb2c54fff1befd975d6cf19/87970943689.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4bf62565343636ac9a3fd9a1b2f5af1b/35207630819.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/c464897c5fc13f6d1d6246d135ec4554/murum.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609841134d749---17588306013.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da7383550f---doduvuxifaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=core+ui+html+template
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7cb.bin
06ab5962b5732a8de0a0917ec7f3ec8e9c5476c4d6305a05d8baf3040f332d2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CB 4784 bytes
font_01_sfnt_off0000d7de.bin
7357681fc1a5bc624f55f3777d3ede38f3b31f7f954b3ad5e8ba06eecaed9b86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DE 10320 bytes

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