Malicious PDF — malware analysis report

Static analysis result for SHA-256 63932246e1312849…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 14:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4c99ec79b1b2d5d4049c0c94e8e535cc SHA-1: fa6f8c5e7482ac4d3ce76c9c54f8fd80c8ae7f04 SHA-256: 63932246e13128498363f15fc11f5e59e8abeb444ffdb3225fb8116665994b23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://gibisch.biz/files/files/fogabufemot.pdf In PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/vujevanige.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/ba7693af39227769addde090a85487d7/kegavelawoledogafojari.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/94093717438.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631008686.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/54701975793.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/fb27be20a329d33d1b9f2bcbb5c335fb/82348329125.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/044479a8080fdf701b564917921772a6/wuzizod.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/bikokudapuxitamekotusonow.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df863546a87---11810587988.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/devomebakifigidux.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/xugowowivopox.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/l03v4t39k4kd6ioos7tr0qhs8c/98484659409.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/bf25b1cdf852742297341b9b4a3e475a/43238332839.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609405f328048---6507806671.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/zupexoxiwepalobudalafugu.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/navakovowapapedomofogabid.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/xafaxapalixagofud.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/tovosaxusudopoloxurezipub.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817e7a32db5---20881977224.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/40464610950.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc856c7288---zigetiwuwakajazavolunixa.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d44fa0792bd3c1c614a3aee1eff74602/povogesuxepidojugewijenew.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/17306396630.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/4861982090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=value+at+risk+theory+and+practice+holton+pdfPDF link annotation
    • 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_off0000d95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95C 10992 bytes
SHA-256: abfb976cb99a45172caf3bdbb3542a73d18d89b2218517ccc2d7160b23c256bc
font_01_sfnt_off0000f2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 18120 bytes
SHA-256: f1a75f649a3d22c6d243b958cea1210f90224f5988c38561ed74ea17fcf797b4
font_02_sfnt_off00012208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12208 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1