Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda9f9482a9a8416…

MALICIOUS

PDF

89.0 KB Created: 2021-09-22 18:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d6a5da3b36b281bd94484146cf5071f SHA-1: 7f8ed18333f2750933d925cedb588d3dc0e4af3e SHA-256: cda9f9482a9a841685aae9674881a175851c720061e36cfcd8250e2f5a0b6773
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://allytemp.ru/uplcv?utm_term=bangla+stylish+font+zip+file+download+for+android
    • http://studiopedrazzini.eu/userfiles/files/bagobuvexevi.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134efb06143b---67138631531.pdf
    • https://okul.gencreklamajansi.com/uploads/files/fivuvoromiwexezixa.pdf
    • http://lexxyin.net/files/fckeditor/file/ketovi.pdf
    • http://kaus21.com/userData/board/file/fagivevapi.pdf
    • https://network-italia.it/file/57314254122.pdf
    • http://vuason.vn/upload/files/70784104251.pdf
    • http://wdnederland.nl/file/61036499706.pdf
    • https://girilawfirm.com/content_files/files/14237547313.pdf
    • https://aromamarketing.md/img/files/27785474313.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/46fe04a07f123c949f6073cb210f0d94/41259042634.pdf
    • https://chinese-wall.tw/upload/files/6989682106.pdf
    • http://werkschoenenverkoop.nl/images/docman/files/xubovaw.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/05a14847b5c12a19508ca89206e2c0da/vodotevawozisova.pdf
    • http://lngpetro.com/userfiles/file/4480189698.pdf
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/46816790913.pdf
    • http://thomas-zigon.de/images/file/dadezamorasujixagujefox.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a4205749e---fopivalujuvazara.pdf
    • http://ohappy.org/userData/board/file/12315954919.pdf
    • http://chothuexeninhbinh.net/data/dulieu/files/fevojepejemutexokuxoroko.pdf
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/67615063624.pdf
    • http://ahkkpcm.org/userfiles/20083808603.pdf
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/26996063287.pdf
    • http://faradtvandor.hu/picture/userfiles/file/63989275321.pdf
    • http://aerotechgroup.ru/img/outer/files/26388364808.pdf
    • http://s292376414.onlinehome.fr/datas/imgmail/file/pufebafawofosexonosa.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_off0000eefb.bin
3bb4b9624be7764add14bd594f6a40ed8a3c4f640a5843c89e13f2248f2e7efe
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 11092 bytes
font_01_sfnt_off000108be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108BE 16792 bytes
font_02_sfnt_off000120d0.bin
957e3b674b57d8329769c7e1854b97aeeb91a663bd8b27b5418f40b1183863d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120D0 20120 bytes