Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e35542a076bf6f1…

MALICIOUS

PDF

78.9 KB Created: 2021-08-08 14:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f983626b3c179856e011b78bbc0795a SHA-1: 531ea4839403bc653c53a155c1e212ab83de2e13 SHA-256: 2e35542a076bf6f167ffd7a7b09eece5eb2e6362a75bb7a296d0bbb53eed1de2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to manipulate search engine results or redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings strongly indicate a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://krisoc.ru/uplcv?utm_term=acca+past+exam+questions+f7 PDF link annotation
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608593f8d2f64---92660256157.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/javomewa.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/a5fab086258ec7b2df5e9a399ff735af/tezixeromavepitimabegen.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/61b8588f94d83212bc9ec921f6a5ec9f/54507289072.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/bifuribefuz.pdfIn PDF document text
    • http://labonscafe.com/userfiles/zekedevuv.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc25f55a89---lawanegivivevusoxovek.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ff028f27e---nupavozidujuvajilif.pdfIn PDF document text
    • https://ip-pharma.net/data/files/sejavuninezopanubed.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/00err00j9h95qu5rbsl1khqvcd/57394487655.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58ed88a071---68534719962.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/zisopesiwomebez.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/xogurimexojojolulepul.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/zuzunobuwixotuboweboz.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/34909373262.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/lirufowutixazoxiruviruwaz.pdfIn PDF document text
    • http://df-2.de/images/daten/file/46236666855.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161085897a6755---fidaxitozamolopikagidawew.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/1391086034.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c988b69d---dorowimoki.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/tusuj.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/13676374652.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_off0000d047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD047 10876 bytes
SHA-256: 2136f50a8a02c1f96ebad09b3c3cd6487ccb72d7a8239c25803b0a23fd52b4a8
font_01_sfnt_off0000e98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001019e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019E 16700 bytes
SHA-256: 52dd0b433a4260ce9be16b01e45e4e635c02693fae702ed342b43977116eea1d

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