Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2e0c44d85f6398…

MALICIOUS

PDF

106.0 KB Created: 2021-07-18 10:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efe7f655f4edbcf1cef5e883a9d31ec6 SHA-1: 3e7d86ea8e1064ef4b88c7c6cfd69a3191eb2301 SHA-256: cd2e0c44d85f6398ce203b3763a4a4595c2fd0f741afafc55570f1e26d0bb2d9
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://citescolairedeledit.com/include/file/niburozanukejoz.pdf
    • https://palezieux.com/ckfinder/userfiles/files/56645822280.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c96685da0cf---fefajavamuxujerepubov.pdf
    • http://oodow.cn/upload/file/210717123550582715a6ljxc4l246i.pdf
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/77880882915.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b23550a14---kaxuvuxa.pdf
    • http://sendedianqi.com/upload_fck/file/2021-7-8/20210708012315898885.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075afe561aa7---ramax.pdf
    • http://euroteam.vn/ckfinder/userfiles//files/movekusugatuti.pdf
    • https://componentcnc.hu/uploads/ckfinder/userfiles/files/44177936811.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/68f7658a1edd13d27c0115ded19bfa42/kadomif.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c49a3604685---50617819823.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8e62d89d0---losigatot.pdf
    • https://foundryindia.org/userfiles/file/27306170658.pdf
    • http://kino-cosmic.ru/sadm_files/nudufigemagavekarugijuwa.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ab599bf6f---22754311105.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16083f9b3a943c---43532669560.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081ce8c20234---77687874293.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7edfe3af6---wexufagosexexenore.pdf
    • http://daiichibus.vn/uploads/news_file/bikoro.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/a3ac745eaeaa62189be024418e364f6d/mazixegubev.pdf
    • https://qualitymattressfactory.com/admin/userfiles/file/48212516879.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/929d87ebfdc28520cc60610d1bb86da3/86710371127.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1730b5125---4543144786.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=psychology+4th+edition+schacter+pdf
    • 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_off00013ca1.bin
d993ead903f6545090c91efb02de5ea699dbade86fbf59e828cf12384c33c397		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA1 16920 bytes
font_01_sfnt_off000168c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x168C1 16792 bytes
font_02_sfnt_off000180d8.bin
894249831a6503e3da5915abbf0fab47c729edcbb56d73f6da45c25b7cae4057		 pdf-font-stream PDF embedded font (sfnt) at offset 0x180D8 11092 bytes

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