Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ef102660c6e4fd…

MALICIOUS

PDF

87.9 KB Created: 2021-08-03 00:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24b50e58a11ddfd89d04481e97ff4212 SHA-1: c75b286bfe16d1f6548450d97ae29f1b4b19baeb SHA-256: c2ef102660c6e4fd300571ddd1927067768d9218d396c1aa19687c1ec044503f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, many of which are flagged as unknown or potentially compromised. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially compromised CMS upload storage further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://tezerwatch.com/file/upload/files/06-12-09-55-43-66.pdf
    • https://betenenergy.com/sites/default/files/file/vijuposukonoli.pdf
    • https://artasedanasingaraja.com/uploadfck/file/mosenuwor.pdf
    • https://thietkevuphong.com/uploads/image/files/37567845325.pdf
    • http://ztkammer.at/uploads/file/kajemumunedetimetepom.pdf
    • http://phoiinnhiet.com/images/uploads/files/40000334810.pdf
    • http://beijingxinzhi.com/userfiles/file/20210508170604_2095346615.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c92775a41---94880774755.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/7d3d595979e922bacf2fed9e3b7ed00d/53505544831.pdf
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/10508259088.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b560575896f---xavirezagewigisituj.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/hn8h3il5d27k8ediju1glihpc4/kunisasavodujamojuduw.pdf
    • http://huile-de-nigelle.info/userfiles/file/23385029297.pdf
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/fofimafubepuf.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9ffa7c2ee46ab90f352ac7dbda6fde73/93705282235.pdf
    • http://mcutech.net/upload/2021/07/file/1626179686802762054.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afe9329231---56537465933.pdf
    • http://carefirstyoungatheartgala.com/clients/b/bc/bc61c41cf33a111e4089ebab1e34a2ce/File/9653853134.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/416jfg8tkbbs1vtvjkejadd6o0/56634708079.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c1d19b49f---tatutaku.pdf
    • https://www.utn.ac.cr//sites/default/files/files/64130783043.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/6ebe1685a8658233d77ce1a545400bc8/nuzob.pdf
    • http://proreferee.ru/uploads/ckfinder/files/modipukopiguvaxigi.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f328001ce3---4480435505.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=north+carolina+notary+public+manual
    • 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_off0000f347.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF347 16792 bytes
font_01_sfnt_off00010b59.bin
f67781ab16d2fb9c752c48d1c51627632a582d1a6bc1918fa41ba099ea3873ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B59 17320 bytes
font_02_sfnt_off0001388a.bin
e8bdd1c25acf4d378201a421f995e275d7c712d6150f1608871333096d0d2d3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1388A 10668 bytes