Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa226795384292d1…

MALICIOUS

PDF

68.8 KB Created: 2021-09-21 05:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2aa2228d5d52a6589c48a1153f10884f SHA-1: 1db21e25eb4661b7b5b8e1a9edab3ec0c659b007 SHA-256: aa226795384292d18f9ccbedcc7c9ca86895887b786649ca89f5358563db3c59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pistant.ru/uplcv?utm_term=hd+wallpaper+download+for+android PDF link annotation
    • http://gyermekhaz.hu/Content/site_images/files/gozavixavilav.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/vivusuwoxudejij.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210909192057_2104084981.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/finisinozefepifud.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/vtt3fpdmud3c0m7negd1eq35t3/26633567118.pdfIn PDF document text
    • http://cbstav.cz/file/rurulakujijalifesafe.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/gifolo.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/rufal.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/93934884868.pdfIn PDF document text
    • http://aprt1day.ru/file/41843537282.pdfIn PDF document text
    • http://tayles.com/uploaded/1875072446.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/wutotiduxubejubirufudofo.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/82535881069.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d95a253924396aa9292ce55a87c82310/81669508506.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/tofef.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/2085380326613f3a5614ba5.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/64645666177.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/gexubabonozurek.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/37965648875.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/kaxadevokewesu.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fee719b87a---37348736987.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/28449075258.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/80689533919.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/66644646978.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/4465282431.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_off0000b100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB100 14816 bytes
SHA-256: b8c72140c9ff595ba3416abc181b141f2ac5b6a86438acde9456cc0b4560ad53
font_01_sfnt_off0000d64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64C 10304 bytes
SHA-256: 82130c01d272431dc6fc0e81ebafe10bab3095a1794a656c99449ada9bc985d4
font_02_sfnt_off0000ed90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1