Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68f7a28b46f4131…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 12:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 02aae78ff6f8691d9fd59f77e4155338 SHA-1: 8b5c1985b32c212cc3e66999a503bada867a577d SHA-256: d68f7a28b46f413124a5c52d3aef0b7675df56c52e14a4dd2a698a15a8c0bf41
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://wastran.ru/uplcv?utm_term=story+saver+for+instagram+video+downloader+instore PDF link annotation
    • http://sibmaxi.ru/userfiles/file/97876471361.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/63959654121.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109062130104834.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-13-11-04-10-94.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/fulerodubijobiwujaxibow.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/daboforurukereravagaziz.pdfIn PDF document text
    • http://www.moyekolodin.com/files/50482251762.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/21665593180.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/4a16ae097ac5e4c7177bdcf95992d14c/lulenopimugumo.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/jaretudufuxudunewuziv.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141396337bba---jisavanemikaminodaf.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161413807308c3---24070106266.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/8e74edcf0ef03423312a17f4608722fe/rataweb.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/97569445354.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/52179487328.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/76456046179.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613832230af0e---94930127033.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/sulorewewajazegugixixib.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/bigupelamewogazuvulizofa.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/73345540639.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fca57610c4---61772612763.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/95564679067.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/7464425250.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/05f08d72e136756110b2729198d31360/lilitim.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/mowuzusaxalu.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4243f980---36959204424.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_off0000e4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 17880 bytes
SHA-256: e5d85aec144db6957e6a5a149fe716cc8ffb268a44ffcd1671c10254c70130b9
font_02_sfnt_off00012ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB3 11036 bytes
SHA-256: 025541cfccee173f17a049cdbcff3abec439df52a468dcd9343852d41f25ac8e

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