Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf59586137b16752…

MALICIOUS

PDF

139.0 KB Created: 2021-09-05 06:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6b5d12361f714d53365a6a70e4dd09f SHA-1: 673f28548874081b320de4a1aa7993484efff292 SHA-256: cf59586137b16752e3a5cb2e74dc1c478341d0455be105312d8a53347597b954
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which are flagged as pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the nature of the links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://hotelamadeustorino.com/userfiles/files/zelejavuvezabozigobotab.pdf
    • http://rocb-ap.org/file_media/file_image/file/10411862228.pdf
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/19302502794.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bc9ca011c---21314674922.pdf
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/68735856450.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/6bede5d0045781d0f1ebb2dc34c0bd85/fezaxoribapotor.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126319e9a42a---pefarelerasosatowe.pdf
    • http://naturestuff.nl/siteimages/file/mogotenunawazumog.pdf
    • https://tonymusic.se/UserFiles/files/fijogojedoru.pdf
    • http://www.gamylai.vn/uploads/files/49375760952.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ig765kapujeqanmpqc9foe5j3t/xemunil.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a1541d3bf---68431610204.pdf
    • http://phonphangschool.com/upload/files/ximewuwuv.pdf
    • http://nutranghongngoc.com/media/ftp/file/38764524887.pdf
    • http://rivucota.com/upload/files/20583329914.pdf
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/kurimudabuxodujosu.pdf
    • http://agroanaliz.by/upload/editor/files/pekogofileva.pdf
    • http://interiorconsignments.com/media/file/11077636326.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7d538a707---xegilira.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/m3904vgn27e57pve4vgi3thke3/wapoviw.pdf
    • http://sys-svinding.dk/userfiles/file/dipipajajojosusudukuris.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cefc45f832---3924032284.pdf
    • http://netmutum.com/userfiles/file/38274947616.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=floppy+disk+definition+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_off0001b9f3.bin
b05cb794255fc820cc97c9a640f0946e2fb624f313c7c63dc412e70d8c3d39aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9F3 19740 bytes
font_01_sfnt_off0001ee09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE09 16792 bytes
font_02_sfnt_off00020620.bin
8b6989c88fed1579b88e55f9f5584d785d727833f82a946d44ac49d64e9e049d
pdf-font-stream PDF embedded font (sfnt) at offset 0x20620 10412 bytes