Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd8c3d9b95c0c80…

MALICIOUS

PDF

70.7 KB Created: 2021-10-01 13:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bb7125f5a94eb6160de8089a5a41462a SHA-1: 4d280b7a2b0cd7f344cc21637ed903abcfc87bc0 SHA-256: 9cd8c3d9b95c0c80bfffd4cd02a6412054d555271d6d09a29af392536791e03e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous links, many pointing to compromised WordPress uploads or disposable hosting, suggesting it functions as a link farm. The presence of these links indicates an attempt to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://almar-bus.pl/userfiles/file/10166065871.pdf In PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/52853327200.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/88634407296.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/64870886564.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/kavaf.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/52779094330.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/dfd3d99076fc1e9b510675a211069c46/zewevotozi.pdfIn PDF document text
    • http://splogservice.ru/content/files/42741762214.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/78103718145.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/garam.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/56685877559.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/wakotugujefunesulugu.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff60f0bae6---62326488627.pdfIn PDF document text
    • https://sibirprokat.ru/ckfinder/userfiles/files/9329352877.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/titepovugibopukoriromajoj.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/fivibisavafutuwinekajofuj.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/kuputarepadimujig.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161503859d187f---8722365239.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/84702157711.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-25/20210925020856387320.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/zokojo.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/15074441235.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/97071152754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=13+going+on+30+watch+online+123moviesPDF 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_off0000b161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB161 11100 bytes
SHA-256: d61b5e93bd322a7067c4f88b9a81caf45ff4bc165649d2666d62e40f12944994
font_01_sfnt_off0000cb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34D 16276 bytes
SHA-256: c2f3474a7766610a6103ca7960132e84053144af2c245f99933887913e69d1aa