Malicious PDF — malware analysis report

Static analysis result for SHA-256 722d50bcc5917e18…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 07:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ac9d3c435708b2973536d19b92f6d1a SHA-1: 997acc2e75a6f2bb46d86d158e2c63d6289a8dfb SHA-256: 722d50bcc5917e187032d5865b2f2161f2edb90c55f1b91ed8f9c1d05fc1bae9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers confirm its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://congtydaihai.com/upload/files/rogigerejonatu.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/425dea34dfffe3940835b881001f0b5e/27101546116.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/e5ea31c2ff83b2e90fffb0da318361ba/76402689804.pdf
    • http://ghespanail.com/fckeditor_userfiles/file/69569402170.pdf
    • http://abnig.friendship-match.com/upload/files/24380029104.pdf
    • http://rivebistro.net/ckfinder/userfiles/files/loxam.pdf
    • https://mamadona.ru/ckfinder/userfiles/files/62067971772.pdf
    • http://b-solutions.net/userfiles/file/boriregakobotamele.pdf
    • http://noahmission.org/dataroom/file/81774705418.pdf
    • https://partroyfuneralhome.com/partroy/assets/file/maroxeguwiredutelafesutag.pdf
    • https://minipowerpack.net/upload/files/pufonujikaperelavuf.pdf
    • http://abbaorphancare.org/survey/userfiles/files/50475638358.pdf
    • https://estoniapools.com/contents/files/83428512689.pdf
    • https://safarekhoob.ir/basefile/safarekhoobir/files/rowigelunurevimuli.pdf
    • http://villalapinetafavignana.it/userfiles/files/bamujizonumi.pdf
    • https://salondumariagededijon.com/userfiles/file/potidanuxukogupoguja.pdf
    • http://skmsm.com/userData/board/file/nopoxewijewunajin.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e833808e93---mamedali.pdf
    • http://cottoneauto.it/userfiles/files/febubelasewaso.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/a688ad18d9d398b97041aabf741016f7/86525802998.pdf
    • http://sluchatka-shop.cz/files/upload/files/pazoruzoregowisik.pdf
    • https://mimpishiosatu.com/contents/files/38631480720.pdf
    • http://wib24-admin.de/uploads/file/23147525208.pdf
    • https://pamukoglu.com/userfiles/file/zojivufowoxo.pdf
    • http://rm-centr.ru/uploads/file/vunuzujuwazafajelasata.pdf
    • https://ceccarbotosani.ro/userfiles/file/45337979557.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+make+comics
    • 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_off0000b2a9.bin
c00578743a690b287b423d0504d6fe5da0a2c8a0806fc343cd3e87770493988e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A9 10308 bytes
font_01_sfnt_off0000c9fc.bin
834c933dd8c8ec2e2377e6b334468415a0df81a11baf8a4e420032f7d63b39e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FC 17036 bytes
font_02_sfnt_off0000f56f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 16792 bytes