Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4eb9cb342c66b11…

MALICIOUS

PDF

86.6 KB Created: 2021-07-02 08:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b76fa0c57f745f20e56d19a492d1c69 SHA-1: 358fcda39ee515d3b19c695c51fd0dafab9fa85e SHA-256: c4eb9cb342c66b11a970e9cbbaf2e705486f8e9cfdec7b7acc0d8ea090332cf1
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. While no scripts were extracted, the numerous embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://stellar-toys.com/ckfinder/userfiles/files/lojifofapiketur.pdf
    • http://jtour.vn/userfiles/file/7611354990.pdf
    • http://pantryscan.com/123cars/imagefck/file/42251016563.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/0kb85bbk4jf50f5l5qv4vn6og4/tesuvuvizekezawegina.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/35fe01296340a729a27ac7c289259dc8/89417697757.pdf
    • http://mytmbc.org/fckimage/file/81611386958.pdf
    • http://wsp.pl/userfiles/file/lipinupezu.pdf
    • http://syuncyoku.jp/upload/file/lilal.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/13946d0496dc38bc2c042283ddbc0acb/piginasirozaxupop.pdf
    • https://aslimitada.com/userfiles/file/8305983985.pdf
    • http://akwarella.pl/user_uploads/file/kosifosapotadolivefize.pdf
    • http://polyalpan.hu/_user/file/loxajenalazelupifiweva.pdf
    • http://bagliodeimille.it/userfiles/files/gawonurozenapurezazotozi.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/mnuqlcj11kcf4tb8a5a784os57/47650372708.pdf
    • http://beiwendq.com/userfiles/file/12506009538.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4dce0f2a5---megemipoje.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/66vmtkgknot2rm21q9u8hcq5ja/71792620531.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c36a9cc54---15308448424.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/a6554c40bf7b48d4c18a29d73b059cb7/vufog.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/2flq7f85o6mflaerhbf0a2ipostcrfco/78119993265.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/18097016a8f079314b5c2c9709185f96/nugimujot.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/8e9c2eb7e90df85ed6a2f8819e65fea5/54557669687.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160703e68d2fbf---zamavikejojod.pdf
    • https://istanajp2.com/contents//files/25171973692.pdf
    • http://emannsltd.com/userfiles/varojutavozinojozegisafa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+body+in+pain+elaine
    • https://medlineplus.gov/pain.html
    • 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_off0000ef31.bin
6d8ef7e711eaba3c0765e2c3c14d17d85a243bcdfb61b96af502f9f422b00f39
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF31 18512 bytes
font_01_sfnt_off00011e0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0A 16792 bytes
font_02_sfnt_off00013621.bin
87110c699e4b8f7ab656b58fdb6f3fcfa24c48be835dd821d376c76ca7aea905
pdf-font-stream PDF embedded font (sfnt) at offset 0x13621 10340 bytes