Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75d4d0a0c59579b…

MALICIOUS

PDF

81.6 KB Created: 2021-07-03 20:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb6f3b5f3c8303a07b2cff74f94da25d SHA-1: 7a17a8f24d87f88f6475cbaeae9bd9e0a136486d SHA-256: c75d4d0a0c59579b9b2d6700c732cb6792a0752a516cc0eeec334b0e66674e99
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised websites, likely intended to host and distribute further malicious content. Heuristics indicate a link farm strategy on disposable hosting and compromised CMS uploads, suggesting an attempt to obscure the true origin of the payload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/e585cef44e37abc00c6b1324782fb4fb/bituwalugasasabusivimidi.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/a8a1f15ca62f6f695ee40881fb781680/99438801379.pdf
    • http://englandmatchshirts.com/assets/file/xemuginotudakade.pdf
    • http://st-communications.com/ckfinder/userfiles/files/9730661424.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6587b1edd7---bunesotakodu.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a707c35992---36923962622.pdf
    • http://mmckno2010.zkosuchdol.info/files/gepimodap.pdf
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/zaritejesed.pdf
    • http://mega.kz/media/upload/files/bogesidaposurezote.pdf
    • http://ahxxzx.com/userfiles/202105/file/potabufubexonibivebuxuv.pdf
    • https://gazelletr.com/userfiles/files/tojakiwesovojoreri.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f2adaf7a8---63487718855.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/df0bc3b531c85648e61f4a5e75e61003/gikenanejotawegis.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/94ada08c7d5f7395eb7bc7dc6edfcc51/28727004073.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/52af3c99665f71337b46aad1d647e769/2255474620.pdf
    • http://bogelaipigeon.com/upload/file/12260239233.pdf
    • http://fouladsazanco.com/Upload/file/72123000432.pdf
    • http://dharmapremipariwar.org/userfiles/file/86158018129.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b473c40610---womikixatinadojugapetapek.pdf
    • http://panziofabian.hu/fck_kepek/33546257145.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d8e0b779---18002693209.pdf
    • http://fairytaleweddingsandeventsbymary.com/clients/f/f2/f272f95a0afb65faa7304057ec0e56f6/File/17390851171.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=title+after+effects+template+free
    • 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_off0000ddc7.bin
82ba388d303c80bc91c7c509e614bec991825cc2d4cd3ba89e8cd1a480c48561
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC7 10380 bytes
font_01_sfnt_off0000f544.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 16792 bytes
font_02_sfnt_off00010d56.bin
f8958931cd765d8ef7aa281bcd9d532bf3570e69275c04ed8816db31d7fd6336
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D56 16332 bytes