Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46bfb3cfedc5940…

MALICIOUS

PDF

75.1 KB Created: 2021-09-26 09:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f66169fb99b9f6d99fdea07270016640 SHA-1: 293fca0a392b601a3db59ef6d2aa41c001a7ce78 SHA-256: b46bfb3cfedc5940bf4c7ba644ea2ea69d619f967add885f5bd15366471b7097
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm or hosted on compromised CMS platforms. One URL, 'https://infrive.ru/uplcv?utm_term=download+gta+5+android+gratis', suggests a lure for downloading a game. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=download+gta+5+android+gratis PDF link annotation
    • http://www.ih-consultant.com/ckfinder/userfiles/files/gabuxusetuzijewe.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/42682208565.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/biperenukulokumetikag.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/zaxasamunubuwa.pdfIn PDF document text
    • https://landviewdesign.com/userfiles/file/72095838303.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/68738669280.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/61878845111.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/zuvalotafomeragodimugabi.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109250413356486.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8506790bf---63674285396.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/sosod.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/29436888911.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613754772637a---29562915268.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/60739491641.pdfIn PDF document text
    • http://olympusflights.com/files/files/widenogufafakefezolaza.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16133c8ece55d1---13555021419.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/dapegugebodilalujek.pdfIn PDF document text
    • http://ccadl.com/files/20210907010501.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/46194065706.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/woxawijisosiziwurejalono.pdfIn PDF document text
    • https://aokman-drive.com/d/files/lutedilijexabigutek.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132b6815cc04---fubidaruvesizekigiremedon.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/85970946300.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_off0000bd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51A 19544 bytes
SHA-256: 05e9fc743471604dbb58da6f57b8d68297370c44c95ceced329d05dcbefcdd17
font_02_sfnt_off00010718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10718 10512 bytes
SHA-256: f1aecf5449cfd13761bfe69d7a0ced1bb4d70024c92eb3a9a2d52459faba6d11