Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7900ce7919b135…

MALICIOUS

PDF

115.7 KB Created: 2021-08-04 09:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 68e8f23076a1f40119f8ffa6d2f6c8c2 SHA-1: c02e6b25961c4f8b393b29063116227479fe3404 SHA-256: 1d7900ce7919b135ffbc4fb356cba61d90f3a4b8806c37ed92432ccbe2134fde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious actions, and the presence of multiple external URIs supports a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706a5f05440---70277489126.pdf In PDF document text
    • https://bloomeng.com/uploads/79862210442.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/29d1927435dc3c4b3960919d5697154a/46496907395.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c53003535---29086497514.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a5851321f---13102842197.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210701041317.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/21740996087.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/kqvi1h9ofskp3ler7ssege92l1/15445145531.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16109d98adca1c---25098003739.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/xewobowiw.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/puposekezobasunitud.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/fifukomerunelenotan.pdfIn PDF document text
    • http://orlickachata.cz/files/files/65530229593.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0b5ed9b2c---57988046491.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/i7t6fv22aia2ldthqvu0jcf2r0/38224924637.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/nerog.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607addd92f3fe---13765821163.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/2af6e3ea9b857c601204a6d9414c15b2/futaf.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/zuzemegojonotef.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/72026368950.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/33236431956.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/tekunirape.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607c705de9bf9---modaliwewanizetixujutadaz.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/tosuvopomoximop.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/2k6us6asqhpou1j4e1k2deo5f2/52342662736.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f8a58a373---magumibinumuzozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+are+the+roles+of+the+first+aider+during+an+emergency+situationPDF 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_off000162ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AC3 11132 bytes
SHA-256: 57f7eea26bcaed5b22df7af2d0a2b9b4dff8e611d8138992d1804b405130d8e0
font_02_sfnt_off00019461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19461 16500 bytes
SHA-256: 1c08a29a1d5182f00b446844cd26e5f3f695b9aabc16f01ead65c9217cf5dfe8