Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f3ba8f1eee1b11…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 00:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 318174a3ce3475cb4a1bdefb41720e4b SHA-1: 13f15dbe55355443ba04dd6603b205f205ec3d6a SHA-256: c5f3ba8f1eee1b115c92ca655ddb15d9cd18f4b82714015a93da82bb099e3c62
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests malicious intent. The primary attack pattern observed is the use of a malicious document as an attachment in a spearphishing campaign, leading to potential exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://irlanc.ru/uplcv?utm_term=geometry+dash+easy+demon+list PDF link annotation
    • https://alteanetworks.fr/img/file/37840650360.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6a4ec6698---48794511911.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/gukobured.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/3948995414.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/85505886119.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/91232263395.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/95563633571.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/lugitarapiserotabirile.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/59759702008.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/vodunibujo.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/87081724400.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/fatesimananotozuzupup.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/lulimopofabi.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/xoworafigokapi.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/dtrbcuvhlppa3rkeg8oerjc3ap/gebabobejivasadose.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/tuzujaxizezutit.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/5290049626.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/63748146125.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55629729314.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/siver.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/80566818985.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/gimuge.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/bajimulovepatidejutiveke.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/34609206124.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/94524270462.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c96abcfe11---loxowosej.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_off0000daf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30C 10668 bytes
SHA-256: 6775105b9dee4e1a6096f880a9dda248c456c0b8305b8be02323fbfae8e09770
font_02_sfnt_off00010b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B52 17188 bytes
SHA-256: f7a4ba91008aecfc87a9ebd65d26c1e6a28b824ccd9659c3ebbda407aecadf73

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