Malicious PDF — malware analysis report

Static analysis result for SHA-256 858ea913530d7986…

MALICIOUS

PDF

170.7 KB Created: 2021-07-13 16:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 907ce0b20665cb6e83c2e049131435b2 SHA-1: 2cc74d447149cc8f98abb2dedb07914ee0a7ea13 SHA-256: 858ea913530d7986ee3f9610c924c01bd3c3468280f2ac0d0033788b056b5ab1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute malicious content or phish users. The embedded URLs, while some are marked benign, contribute to the overall pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9679

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://e-kva.ru/admin/ckfinder/userfiles/files/43419274081.pdf In PDF document text
    • http://animationcoach.com/userfiles/file/92213105234.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/h42u70pkoilcrvnm6hh2p6h9ql/25643046150.pdfIn PDF document text
    • http://point-grey-1970-grads.com/clients/f/fe/fe7686cf254963525dc0bd811951f15e/File/18809232080.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/4bdf91856cf5987a5acbca80f079b035/tupum.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/84202503629.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/tumanu.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/60993146250.pdfIn PDF document text
    • http://tcihk.com/userfiles/57814968638.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16078eea6172ce---44695023587.pdfIn PDF document text
    • http://ty-int.com/files/files/30373429358.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/67169806671.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608325c492bc2---91942286953.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/b09ss78p7oqu81lff7su1vaao2/7169865941.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/17631110729.pdfIn PDF document text
    • https://agatanorek.com/files/file/linap.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ajf1jrf9nngojt3u0l6qgebrm7/kotefokuwawalizobukupej.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/dizimuxiletolojij.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/da76dbc7739cfe3ecea73d374af2887f/tizanijitaz.pdfIn PDF document text
    • https://curvy.tw/upload/files/57692009566.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/sotoxikorumubexugeguso.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c3d1395fe7ed5a48debdc24c268445a2/wikibubagitigujaxub.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/tonudukiwojewisiweto.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/34056715153.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/fepaseruselawokijinufaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+ring+structure+of+glucosePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21CC8 10516 bytes
SHA-256: a6191f83ecc4907420eeddf832153a790ca933634d13237b40eab08cb8556e6f
font_01_sfnt_off000234ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x234AD 16072 bytes
SHA-256: cab8ceee6dea85bf437db9fdd562b8a0aef74c4066cefe7f2a83a632bdc35db7
font_02_sfnt_off000249b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x249B6 22708 bytes
SHA-256: 75588c8cb9bd36c705b77626e86ed31aa766bf17b3f65c4695ff1322c6c5c37f
font_03_sfnt_off0002842c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2842C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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