Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bf197154f19d59…

MALICIOUS

PDF

85.0 KB Created: 2021-07-07 08:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1c20e47d2b579451a56713575957b23 SHA-1: b6d59c94a803c52c53c77532e0e9e70e3aa95839 SHA-256: f8bf197154f19d597ff91ebc39b0d626384928022f5643cc88fa0be322d1c99f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised CMS upload storage, suggesting a phishing or malware distribution attempt. The presence of 'utm_term' parameters in some URLs indicates a potential tracking mechanism for malicious campaigns. While no scripts were explicitly extracted, the heuristic firings strongly suggest the document is designed to redirect users to malicious content hosted on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=nintendo+ds+free+download
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad50218797b---56103467698.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/d364bf91b346a13be583bd14ffabcddc/sufodaxabanix.pdf
    • http://studioego.cz/userfiles/file/66623650262.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a58bbeb6ce---supumebuwuvezebeka.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3fce96cb8a---64419503308.pdf
    • https://prtl.pl/userfiles/file/43192948499.pdf
    • http://medrea.ru/upload/files/99499325379.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c8fe15aec---52556868188.pdf
    • https://canevastoilestjean.com/upload/editor/file/vinage.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ea8059069---jopojapisofifobumunada.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/i4v73ku4poa9n2eih1is112jbs/48930555902.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/cbe2bc6e2ec6514c6922d32d21ede7de/43461658676.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/nosid.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/9f55061c4e803851c24253e821a1902a/99719291203.pdf
    • https://erdemlerkoleji.com/resimler/files/gasolikuxixakibekusivew.pdf
    • https://pfhotel.gr/ckfinder/userfiles/files/ruvuwaxaf.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3d23917d5---zijenunotanij.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b455201acf5---86169792588.pdf
    • https://jackyrouxmethode.com/userfiles/file/66693399503.pdf
    • http://www.buildingmalawi.com/images/uploaded/documents/mavizifepiluzowumipat.pdf
    • https://mn-lawfirm.com/box/userfiles/file/56235356851.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/rk2kf7591ranccgba4c93qst67/26675948485.pdf
    • https://lamthong-marchph.com/piceditor/file/40094933366.pdf
    • https://okna-stv.ru/userfiles/files/bafadanunu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec18.bin
0c8124c4f10ddaf307c880d1d85871dcb5fb65576c24810e580036f8de518fcb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 16456 bytes
font_01_sfnt_off000116d1.bin
15580bb6200991ca720fd1a986838a513d0bca6aa1ec52bce7204f8db1d1da79
pdf-font-stream PDF embedded font (sfnt) at offset 0x116D1 10408 bytes
font_02_sfnt_off00012e8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8E 16792 bytes