Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8088a88844f6c00…

MALICIOUS

PDF

86.7 KB Created: 2021-07-21 01:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b80de94fc2abd1175d4aa094e87a6a8 SHA-1: 8f12e13ad56ef9d934c284136d2c8e77172dd85a SHA-256: a8088a88844f6c00468f748e7d6b965946e91546cb5f0742a30cffefb7ea5811
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content or downloads. No scripts were extracted, but the presence of multiple external links on compromised sites strongly suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/1fdaf2831b36f391aa99a579d69d0eca/xuzejedu.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/d2c7b6535de293327294c1de05b624a7/pisepawuriponagusexeget.pdf
    • http://tv-sat.cz/userfiles/file/58535100273.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ffc750578---saliwagufunifotefewazep.pdf
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/44353400081.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/21044d5d3c68fa53b1f15cd61bd6ce05/54636326247.pdf
    • https://faceless.me/userfiles/files/36225702755.pdf
    • http://sarljarry.fr/userfiles/file/42729754290.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4bc8e098d2---vipagajakizumuwi.pdf
    • http://beijinghuojia.cn/userfiles/file/15157599736.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/ec2d56a7b9801e98effca85e511aa0af/98070601921.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b613201e84f---53706533910.pdf
    • https://reitinguok.lt/userfiles/file/xukasabenaditenilulaj.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/jc2ugmn3grsek7dhr8s23fmv7u/kugususinixise.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/54de0512847865596c4d3ab2220ebc8e/79563882423.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fa2e3789796c5f06a98952d6a3d43fa4/1918374427.pdf
    • http://csc-0411.com/userfiles/file/20210705215232_wlhkfg.pdf
    • http://nanumed.ro/uploads/files/91524711542.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607145a074316.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/f136174d9f195ff8600437048069ef85/legajopiwopuwujevevirutap.pdf
    • https://ev-owners.jp/userfiles//files/35388197351.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=future+bright+song+download+mp3
    • 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_off0000eed7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 16792 bytes
font_01_sfnt_off000106ee.bin
2e2a75412900c5a84a66d4806d19fc056bf4b8861bc2ee7f59b994c3b30d495d
pdf-font-stream PDF embedded font (sfnt) at offset 0x106EE 11312 bytes
font_02_sfnt_off000120ed.bin
16defe116230d4b320283d0349af67e3e9d8041303b45c50d0d74fd777c18074
pdf-font-stream PDF embedded font (sfnt) at offset 0x120ED 17096 bytes