Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd38ca093743595…

MALICIOUS

PDF

187.6 KB Created: 2021-07-26 05:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1860ce8ab65efd667af5cc48f2107a1c SHA-1: ce32df9fd289ca7147708f168ef21f0abd853d7e SHA-256: 4dd38ca0937435951811de39ed6e6103541d56f325b28c37a27bdbe241ae4be2
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. It contains numerous links, many pointing to compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://thenext.pk/userfiles/files/tirenitaginebubo.pdf
    • http://avision-italia.com/userfiles/files/jopefunepozofafaf.pdf
    • http://a-swiss.com/upload/userfiles/file/74485236343.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a80f8fc1afb---52035291691.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c6bfc31bf---84624319758.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7568c12479---zirixigiwakilababiwi.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16094dac3964c4---zujodemazemuxopubebafonuk.pdf
    • http://meruzhankhachatryan.com/app/webroot/files/file/52064471532.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/591d717e6dcd1bbda2c0ad79b73910a3/tarusoz.pdf
    • http://apvn.info/userfiles/file/sizeli.pdf
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/dukivunuzofigaje.pdf
    • http://coffee33.ru/archive/file/pifulumigugaripizemadi.pdf
    • https://artlabjo.com/userfiles/file/53779271945.pdf
    • http://lab4050.com/upload/editor/file/90156693220.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f059a69051---tewivovoposomogobefekap.pdf
    • http://ore-processing.ru/d/files/kewaxodewupupup.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfebace84d6---konovigunidom.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/508egjsqn56lbnumj6b8or93f0/kizumoxoxes.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/etbjk8s10pstvfuc7v5rm6d1jr/18844176561.pdf
    • http://pratiklinik.com/img/userfiles/files/geguz.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/160439765dc294093cf46ca525340636/10047694240.pdf
    • http://absolutelyneon.com/userfiles/file/vovumijemumujaro.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=f%C3%ADsica+para+cientistas+e+engenheiros+-+vol+2+pdf+download
    • 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_off000274bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x274BB 16792 bytes
font_01_sfnt_off00028ccd.bin
75bcf4ced297f9c9a39821f9c573b66f255c507a20220b239bd5c5fefbcd5c93
pdf-font-stream PDF embedded font (sfnt) at offset 0x28CCD 22624 bytes
font_02_sfnt_off0002c2db.bin
9da05f4366ecd53faef9461bf4d78b3ba3900f7a8cda8800a1ad3da71b999fc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x2C2DB 11244 bytes