Malicious PDF — malware analysis report

Static analysis result for SHA-256 8985035b917411d9…

MALICIOUS

PDF

93.8 KB Created: 2021-07-15 11:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8d55a3c0d56a5edeeaf9076b2485c159 SHA-1: bd544b7180a5b255015a26402ad92b04e264b150 SHA-256: 8985035b917411d9d4861c781e65f2be846b7d727b722fdf2f1b5e3131720024
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs that point to compromised websites and other PDF files, likely intended to lure users into downloading further malicious content or revealing sensitive information. The presence of multiple distinct hosts and the use of UTM parameters suggest a coordinated effort to distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://pistant.ru/uplcv?utm_term=reported+speech+advanced+multiple+choice+exercises PDF link annotation
    • http://chaitraglaze.com/uploads/49806738058.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ddd6eb5529a31f42360b4da47378f498/wolegososuzel.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/xizomenubekomi.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/9066551812.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d5cff0dfb2c---90787927750.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95d5ae10770cc11d51fd350ca3d813a5/gijamojanoxajomowefuse.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160945c5138aa3---99693480397.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/a1c016fec12dfc38df0ab5909e9d0120/vetabaxomamuderaw.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/ponajatofafaxij.pdfIn PDF document text
    • https://aokman-drive.com/d/files/zapefetoputixupivafegi.pdfIn PDF document text
    • http://petrduchek.com/files/gomumizuzenupekon.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/15421328318.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b41cc25c1ee---zobawerumabul.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/baligimulajexof.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/71481150146.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/48197919765.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210715150308_1021554822.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/4onh9gqum3d5hu5njvre1092ar/24882014833.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/69497843826.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/39254795440.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7403e249bd90047d65786bad3466755f/womabo.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160799603033f8---gatowi.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/gasusezumenuxisukerabolaw.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/kemenomujuxofadasazero.pdfIn PDF document text
    • 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_off00010b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B43 11092 bytes
SHA-256: 93286fe4edb3cc370db68ae2992c4f6ba9b9449fc06a7e69debfdfe09b31bf27
font_01_sfnt_off000124ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EF 17140 bytes
SHA-256: b56560c3b147010ccf7e1249de0f6baa755431852ac7dbc09f7497c5fb21e343
font_02_sfnt_off0001517a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1517A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1