Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5f57a606eeb0de…

MALICIOUS

PDF

94.3 KB Created: 2021-05-26 16:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a9d6c19255c52a29f65ce6bd9a02b6e SHA-1: f83bdfe30706b255967ffab0f15e0519e070b315 SHA-256: 8f5f57a606eeb0de8b8d4f56b1cdc3ff2bcb59e514e95bce728468976dffa5b7
156 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body and heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on compromised CMS uploads and disposable domains. These links are presented as downloads for a stylebook, likely a lure to disguise the phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7984

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/42d1c127f783b74f7e3102b871c4346d/rokojimedetimosese.pdf
    • https://prairieroseclothiers.com/FCKeditor/file/safazixuwo.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/2949d875b815642306da6a78dc72ba65/zigigawunibuwipabub.pdf
    • http://fygl.net/uploads/file/110947075473.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/4ccd4da35d9403a1aa520b59ecedc6e0/gevoroxugo.pdf
    • http://www.awakohchang.com/image/upload/File/upuvap.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6f9b2a81a---2140248133.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/4nogq11nfqkk07vg4ql90d8eir/gujedopupogidonedazo.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a154ec63457---gamokif.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160866983501fb---40908863892.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6mfka7vtu1ut6a0mjqv566bio2/rukolagitajidituketadivam.pdf
    • http://ricarda-allegra.de/userfiles/file/sabutanumobivinibofo.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/271eb5523108b5d026010f418dc407e6/jetivux.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/92b55bf22cf1da4c294f19ab29730520/45257803161.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ap+stylebook+55th+edition+pdf+free+download
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012fe3.bin
22c76ee65edbcc6a6b161a576995e99f02c60128a19bb24b76a34bd659950294		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE3 5428 bytes
font_01_sfnt_off00014257.bin
2604a0e077ecb09c209da668923dcf19ada2d1bf2f927db5f317defa0c45c641		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14257 12436 bytes
font_02_sfnt_off00016bf1.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16BF1 4324 bytes

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