Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cce44614e0a22f7…

MALICIOUS

PDF

98.8 KB Created: 2021-09-08 03:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f992fab56d09d60120f3259181fe6f35 SHA-1: e4db219d16a05238b17cd40c1a299341a7289372 SHA-256: 1cce44614e0a22f7a9658c15a6bd2d297beedece6e2fe7a05bd4b48fb515d9b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various domains, some of which are hosted on compromised CMS upload directories. The document body is obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://elma-itc.ru/!upload/files/nikirofafizaninilububimuz.pdf In PDF document text
    • http://prodottoitalia.eu/userfiles/files/49654396745.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/29840129523.pdfIn PDF document text
    • http://belloverde.net/emailer/file/wawenamot.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/pumozipisajaxerujopekaza.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/29074390597.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161059ff8984ad---lejabijosumedepomakasagus.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/59524492036.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16102cc7ca8089---mejosumususilig.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/30255340145.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/92792817044.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/19893093692.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/4a9a063953142167cdc2b04d08a440ff/39680684841.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/2d56aa37731c50978f7d83b40b0d421e/pizunitemalezaza.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/21ad258ac4cc17790d2cfce4b65a1ada/lifukujovuxe.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/7ad0a355b5bdc4d0aa9347477998d727/34561238117.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/fbe8vul0h15op9q8no3mctqgl6/zipiridal.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/6406572975.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/659646ec4a9482503ed45c66829201f7/tenidanunodexaxifaxi.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acd2a3bfa41---zovefa.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd43149242---63254873569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hollywood+stars+map+pdfPDF 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_off00011d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13575 18904 bytes
SHA-256: f618d83963a5e749c37d1cd116e0dbb0012a5e81516893dc626eadeb700bf87c
font_02_sfnt_off00016646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16646 10520 bytes
SHA-256: 169a174a5ea3ac9e420340f5e4eeacfef9b13526e464385807bbc6eb0ef8f993

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