Malicious PDF — malware analysis report

Static analysis result for SHA-256 a332dcd938bbff54…

MALICIOUS

PDF

77.1 KB Created: 2021-06-07 03:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ca3e31c421fe7a2c825316442ffd8aa SHA-1: 298e4915b6f9792c1c39914c9e1020438403bef6 SHA-256: a332dcd938bbff54632a78bf4169d088b378926cb997708e89651fae7ca3e59d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics point towards an attempt to exploit user interaction via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ketchas.ru/uplcv?utm_term=%25C3%25A1reas+y+per%25C3%25ADmetros+de+figuras+planas+ejercicios+resueltos+3+eso
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844306b7e84---gozokenuxivuridokim.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/d0d72ae662c2c9b95dbd5128fc1a445a/54384786235.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16096d9e9f08b4---292559613.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acdfc2bc028---65784930842.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e783db0244---kisijodivefisinitivurus.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/88f9b9877c4e139e18b57a4155da70f8/joxisozenatudikilewu.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c71a980d35---navepidigulazemelosadoxuz.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160986b6bbe8f6---62798117959.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/51b0cb3bb913f9690c37a53fd41ddac9/talofur.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b74b71465fa5b9e69c7fa804e900837c/97222649254.pdf
    • https://angkalaris.com/contents//files/tazoravepokutojigusiwil.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a31d373b3b7---devomebazelalobivapavemo.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef32ee0ca1---52075105038.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/6cc3cc89d22e27d3d0e9aee6ec8bf5c0/35664357331.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/9fe755a5318549725dfcacc1420492bd/guxekegowanuj.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0a1b44eaa---4975617741.pdf
    • http://viprealestatebrokers.com/userfiles/files/xebozinurasoruwokiwetolu.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddd5.bin
0250c13f99a5f966d76d777a1c600232bdbf9eb71c1274020f87e67cff644a9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD5 2616 bytes
font_01_sfnt_off0000e989.bin
896fb4f05799a3780e5337a1ca72cdf11773e73b110a2a447223fc2e9d9918c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 5884 bytes
font_02_sfnt_off0000fd9d.bin
58716cca633be47a309218add034385856c6efeeabe56adcc1094474087cd0d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 11492 bytes