Malicious PDF — malware analysis report

Static analysis result for SHA-256 e266d4c893c00417…

MALICIOUS

PDF

70.6 KB Created: 2021-09-18 15:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c9b6073d7dd5c99fb86342a560711505 SHA-1: f6238ab91ff04e48ec19e5be789547ee83a2ce39 SHA-256: e266d4c893c00417d4555092bf2a1117252cf1fafe2769fc0c5d6a4ec9e3b199
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites to host or link to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=wwe+undefeated+download PDF link annotation
    • http://technoprofile.ru/userfiles/file/89472340382.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f599174fff---zepekekowadifejumetug.pdfIn PDF document text
    • http://polkovnik.su/upload/file/94153919392.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/mobizagugivowataluf.pdfIn PDF document text
    • http://calisnt.com/uploads/files/munojulifufiboneji.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/41273936810.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/tmm10i2a11hlhj46l93ikvdg77/rekunaxa.pdfIn PDF document text
    • https://desco.scp.hr/files/zewizifejemal.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/lafutasewadoramu.pdfIn PDF document text
    • http://master-vin.ru/files/file/71508544864.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/39755945467.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/gisinuku.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/fomokigote.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/50332275676.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/favagupumovuroguxonimi.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/19248265915.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/xakuxogosatogenapime.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/bopipijufuwojeremamun.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/gudilazidideduwibuwebif.pdfIn PDF document text
    • https://nuteuit.ro/ckfinder/userfiles/files/towikavutakidis.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/63322359861.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f161734fa---wuzatemosavolab.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/kidategebuki.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://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_off0000b6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A9 10164 bytes
SHA-256: 2cd93404127613d51436d25327fb8ec5c8a75fd2bebdcead69d51f2d74ca18e6
font_01_sfnt_off0000cda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B2 15968 bytes
SHA-256: c1768f0237fb756611cb939a49ab561cbf8858192059b902232a72861533dcee