Malicious PDF — malware analysis report

Static analysis result for SHA-256 3896a9112fa1e31b…

MALICIOUS

PDF

85.5 KB Created: 2021-09-22 23:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4310365dff989629f417a3eb544ca074 SHA-1: 21e126bbcd44374e87daaf712d9eef2145793b1a SHA-256: 3896a9112fa1e31b0f3c046592a5e2279cc43a442d31bdcf01a31fd12ea682b5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to redirect users. Heuristics indicate a link farm on disposable hosting and compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.hmgfinance.com/ckfinder/userfiles/files/tategoxujorolit.pdf
    • http://actybrain-consult.com/Upload/files/66308970728.pdf
    • http://artsar.pl/userfiles/file/bexaja.pdf
    • https://vwb.mrv-educationservices.com/content_file/files/kedajufugirapif.pdf
    • http://balone.net/_upload/file///delivukevosazenojozisa.pdf
    • http://zssadkowice.pl/pliki/vudunaleketasifas.pdf
    • http://dkkarsin.pl/img/upload/files/dufumepakuputekazige.pdf
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/nebofevofawupow.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/e72d88312a8bb7ccbf521886c836f98c/givuzojusexenopezoru.pdf
    • http://jcnjl.com/userfiles/files/63249997779.pdf
    • https://highlander-inn.com/assets/userfiles/files/47574847542.pdf
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wakivowinutevedexipo.pdf
    • http://interroadholland.nl/userfiles/file/32864294668.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/88744707856.pdf
    • https://mahae.hu/files/files/48682210015.pdf
    • http://theartofdesign.nl/ckfinder/userfiles/files/lizomezaka.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614adc2fed1b3---41947577854.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86472415229.pdf
    • http://lycee-elm.org/userfiles/file/nokasupisanapokewekobupo.pdf
    • https://systematix.pl/userfiles/file/fasunowevu.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/m20mappca20t1lrca0k4a12dh6/sagamaxi.pdf
    • http://rockefellersgold.hu/editor_up/69733786312.pdf
    • http://bobiniauto.com/userfiles/file/gewufulewo.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613178092620d---kisuvolezebafap.pdf
    • http://domusanna.it/userfiles/files/26945396954.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=descargar+mp3+android+app
    • 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_off0000e8a2.bin
2a4ae81a3885476551f1a05dac1d7a1a37b53a147da2027cad78d2c9f45395d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A2 10888 bytes
font_01_sfnt_off0001019d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 16792 bytes
font_02_sfnt_off000119af.bin
0c1618be5f5908438354eb79934b742a2df878aea0fc28fb6071eed41f45b453
pdf-font-stream PDF embedded font (sfnt) at offset 0x119AF 18056 bytes