Malicious PDF — malware analysis report

Static analysis result for SHA-256 942f1c8f8a437f1d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 04:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 00fff0cb084084df04a157cfdd921e30 SHA-1: b50037c1760df4609b4d8e039e7989dffa66bdcb SHA-256: 942f1c8f8a437f1d77d217c12b87dd866048749d0cd3b5198d1b063c72929ecb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using these links for malicious purposes, likely phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=la+n%C3%A9gation+exercices+cm2+pdf PDF link annotation
    • http://anaminfo.com/attachfile/file/darikajo.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/4df5287ef0c4d7ef74f8050f9f7379d4/jitezemifepupikoxaz.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210708_37991DC8754308E0.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607988e9d6b63---60241234504.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f681691104765c45d37f80f1fd407a24/11602181222.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/supupofojutolutof.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/32451260840.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/kixamisixiwe.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/kapesimilopiwukaxe.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/pafunigumar.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/kilegu.pdfIn PDF document text
    • http://jadeite.ru/images/file/98089162057.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/89977753900.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5907e4c41285feb2392711aee469cc6f/49833682510.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/74308198455.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/28959034833.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/f085dba7bfb498b1f6dcb9ae98f3d481/86408192177.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad41b253d5e---37261639044.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61928950847.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/binumogaz.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/48e20ab5c5641f8883d12a41913bc9b4/88406507204.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/4401307682.pdfIn PDF document text
    • https://guijek.com/userfiles/file/molewumu.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_off0000d79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79D 20876 bytes
SHA-256: c041922c296addbd9c0c4c9462653cfa736cf31c934b875cbcab7df1bcb7fece
font_01_sfnt_off00010bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D6 11252 bytes
SHA-256: 4d4d52556e349a68acf2b18c763d0c877b2469d4c9dc32d132449463b06296fa

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