Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e372beef02b15d…

MALICIOUS

PDF

79.6 KB Created: 2021-09-04 13:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ce6952021c3c11ce8df593fcf3185bc7 SHA-1: 2efbbeabf93e511c8c7493aed837d36f75774329 SHA-256: f8e372beef02b15d039d5a1f49fb92de92004f862e705ec038aee1715c43d37b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the document's primary function is to act as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drafthe.ru/uplcv?utm_term=computational+optimal+transport+pdf PDF link annotation
    • http://anhuifan.com/upload_fck/file/2021-6-11/20210611224536905385.pdfIn PDF document text
    • https://t2sc.me/userfiles/86763662525.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/74792750476.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/o4hsoelg1dnn3n8e6pt5lkuam5/raxinapuwo.pdfIn PDF document text
    • https://lesura.net/userfiles/file/68773162603.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/bigomosokekemof.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b54d4c86---28147318483.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083320558578---20734563508.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d571afd85---newalupatizojuzubasibufo.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/76118756422.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/6063895743.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/12330380061.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755a3eb1e81---lirazowizaduxabagufewavat.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0893b824e---2863631066.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/89390552759.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8dfa0facb8fce6aca7cf60de7d8e3f04/53666480085.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d684ea3d83---jexuxunakaxosi.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/seluwobiweziji.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3ba61a042---31376628012.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ed2904ba---88620823120.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/wagukopinibagete.pdfIn PDF document text
    • https://rajakedua.com/contents//files/latonoluxodezomudoxevatoz.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/makuguzaw.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_off0000d49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 10660 bytes
SHA-256: e7b2a9f9cac9a8ade2b4d22b617faef8b807b6e749a1248627fb4c3dd07d64de
font_02_sfnt_off00010508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10508 16984 bytes
SHA-256: 922bec6fe76024006c547904891e99a539de5527378a2a39e4f9095462afd2de

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