Malicious PDF — malware analysis report

Static analysis result for SHA-256 4701a663fcc9d73c…

MALICIOUS

PDF

74.2 KB Created: 2021-09-25 14:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 354721b47002986c57597e5e2d8e276d SHA-1: 2774417f90d7da5c7543538c92a3c1d1e6a56ecc SHA-256: 4701a663fcc9d73c93b82f057481a7b11018d6a595b37c962261e06d45786bd9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of external URIs and link farms points to a tactic of directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://www.medicellbank.com/userfiles/files/wogimorowexazisokuxu.pdf
    • http://rs-entp.com/upload/file/xisegole.pdf
    • http://travelshops.pl/userfiles/file/fuvivubapiminiridoli.pdf
    • https://rintrans.com/files/fegisimukujafipama.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3e2cd2236---likosonale.pdf
    • http://gemcom.org/userfiles/file/67988881494.pdf
    • http://av-jet.ru/userfiles/file/60626637620.pdf
    • https://autonoleggioassereto.com/file/80692989358.pdf
    • http://ls12368.com/userfiles/file/gipuwifagaf.pdf
    • http://sungwoo-n.com/userfiles/file/pokimikinuku.pdf
    • http://ahzycw.com/upload_fck/file/2021-9-15/20210915191639731263.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/c79be3210089bf8eceee6d42de8f7287/bizudanigolorabola.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d7156da5---daxupafenevij.pdf
    • http://thingsantiquesla.com/userfiles/files/20101079484.pdf
    • https://mancomunidadvaldizarbe.com/userfiles/files/63009144155.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613de8ef4df75---mewawenisixafudoxakemuxo.pdf
    • http://sanyosushiglendora.com/uploads/files/fesugotalowajemimil.pdf
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/weditenaluzelotuwef.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/62c057c3ae92c14a9b4d3a149f207bab/18804885501.pdf
    • http://xhiehchin.com/Xhieh_News/_file/77430583665.pdf
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/wejebovezuwojexasubosak.pdf
    • https://planningpvedh.nl/ckfinder/userfiles/files/goxinir.pdf
    • http://ttmm.co.jp/ckfinder/userfiles/files/femutumegojuwanevinikev.pdf
    • http://lamekatus.com/uploads/ckeditor/files/zojep.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/baxuzixawodaxadunutedaze.pdf
    • https://zegaoyun.com/calisma2/files/uploads/dijebefutajaf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=habilitar+depura%C3%A7%C3%A3o+usb+android
    • 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_off0000b988.bin
a8d145a94e4ff5c625f29979be2dc47b459a149444ea24cb8a1e9e8e14a7c794
pdf-font-stream PDF embedded font (sfnt) at offset 0xB988 11080 bytes
font_01_sfnt_off0000d2c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C4 16792 bytes
font_02_sfnt_off0000ead6.bin
ac49c356c0be98f540df4870784a44cfcb55eebdce6d6c1f259991a39bb0be99
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD6 18148 bytes