Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c22555b9fa9811…

MALICIOUS

PDF

86.1 KB Created: 2021-09-17 23:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 432f2e8b1d8f3673037ea14447fd5e46 SHA-1: 09657db2f26e8522bfbff9a1fb03cfc078ed32bf SHA-256: 74c22555b9fa9811dc85ab85eaafe04cb55c71bd0cfb94b43038d282c25fe68d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL distribution are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=digital+art+apps+android PDF link annotation
    • https://felicitareonline.ro/ckfinder/userfiles/files/64143642391.pdfIn PDF document text
    • http://oris-am.com/editor_up/sigamafonedazu.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/jofaxomizonufiwegagam.pdfIn PDF document text
    • http://pmke.cz/pictures/files/76484313623.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137d2ed1162a---gigitarapadinojo.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/gugoxabolitalev.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/91001492791.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/54529242501.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/83936035580.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/35970181235.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/nopugoseturuxaka.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/wowizuzunibusosojirezekot.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/gewuvezufifevebugodulef.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/464850d38f3e20d0b92f5af327e16805/76525144697.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/98101044860.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/85687738689.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/84105228273.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/mezanabomuseporoj.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/8212209402.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613902a09bc28---sajuzajelilemozoboz.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/92061048089.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161371bd6338dd---98768528012.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/57149835377.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630587750.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/60407437211.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_off0000ed31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED31 10436 bytes
SHA-256: d96ab53839802d7d7126f4f25ddab1bc927b03f659fde829ff73fa035f5a2fe7
font_01_sfnt_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC9 17616 bytes
SHA-256: b75ebb46549ddee4be39b2a14e7064268dddcf4b6ff0af4c66c2991ceb4a6fd2

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