Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b412bc218136bb3…

MALICIOUS

PDF

85.9 KB Created: 2021-07-22 00:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ffc7402ada62ce1ada2c0c978f7d0826 SHA-1: f6de6cf2888193249cea3881bef037bf51b35953 SHA-256: 1b412bc218136bb3d919e0b6060339bee8778fa21c1ad910d93997ace7876aa3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to potentially harmful content. The presence of these links and the nature of the detection point towards a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e4af991d1---82033243577.pdf In PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083afcb036cc---vojowatutaxak.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/ac4a51586773adbe18dcb09cee49fbde/27027957412.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/wapedavabin.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbac1f9722d---36018128501.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/viwozoguxoneli.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c6a1da70d---goronajiji.pdfIn PDF document text
    • https://dcimx.com/files/29007716527.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/kidepo.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d9282cd0c---tokiguna.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/aqv7mr54f8j604hlraqd054f17/19538760319.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/25574130878.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/2cd3418c6c2d59baee85c51575f1402f/todezutuj.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/xipakawugaf.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0f37364c7---23761134199.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ef421f101---74367124090.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/fepaxasitodagedozul.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/dofupivovijosokulino.pdfIn PDF document text
    • http://rc-modeller.se/images/file///53795651476.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/44483586360.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/tedutonokupom.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/wevubamefonikijivobaso.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/po4vptr7fpldiccltae0n5fs9f/13506802780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=chapter+3+cells+and+tissues+answer+keyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D0 16576 bytes
SHA-256: aa21aba4c84e615a4c80993bd653b26b6e52e74a725ea2c56b16d128525cdd36
font_02_sfnt_off00013093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13093 11088 bytes
SHA-256: 0b7d36767080f6bc99a054d8f42123bbdbfac14689e95d94934d3fc93e7f6609

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