Malicious PDF — malware analysis report

Static analysis result for SHA-256 3113884b372e3775…

MALICIOUS

PDF

80.4 KB Created: 2021-08-15 19:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f83c352b104558587f34568b6693155 SHA-1: d18d4af165b941c6d621f61ff6f707e229506ff5 SHA-256: 3113884b372e3775e1e8287283e79fced5d844ae9e64464178c326f63669fd42
156 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution lure. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains. These links likely lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/10948671072.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/6c72cd8b614c1527d9e583f371171057/89998646742.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/niruwimajogeg.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/2eb9cdbda286c0bf19f59a1e64ed55a3/tizawizonexolotakiziwi.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/89d43bc2111568c967576bc693c89c7a/mesizezali.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/potawamije.pdf
    • http://soupworld.de/upload/file/60115934994.pdf
    • http://france-ex.com/pojilejiparobuza.pdf
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/75462151690.pdf
    • http://hainfelderteich.at/18938737005.pdf
    • http://cesishotel.com/res/wysiwyg/file/13479632022.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e00b5d1ac---12957343642.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085640674a81---66682925954.pdf
    • http://live-net.it/file/feleka.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16077f2cc801d9---95928898438.pdf
    • http://tipiland.net/upload/file/86827423740.pdf
    • https://alubiasdetolosa.com/files/galeria/files/nekijowetimojakaso.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/bc0529ec09e80b6d69cc81dedb2c20c7/dekunadowotajup.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25bc16e9e1---2325288281.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7023f582b1---26022361479.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160842b8035c93---wikemij.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+turn+off+logitech+webcam+light
    • 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_off0000d8cf.bin
82a1955d023b30c0a8f07083866892f245ae4c59fd35b0a5c14f83776c40cf51
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 10932 bytes
font_01_sfnt_off0000f1ee.bin
44b3f1bacc628e78d93edafef778620c42195a36eede9f4b4157800938724e5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EE 16620 bytes
font_02_sfnt_off00011d01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D01 16792 bytes