Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f7439f12ad4756…

MALICIOUS

PDF

79.6 KB Created: 2021-08-11 12:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 639f52596c24e145b63b1e346df4151c SHA-1: 7b307997596dcd76d5e971f2fb71a7c089d29d26 SHA-256: 67f7439f12ad4756a71c429514879b73106e97af704417a4387a8596e75048c5
156 Risk Score

Malware Insights

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

The file is a PDF document detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised websites, suggesting a phishing or malware distribution attempt. The presence of multiple external URIs and a link farm on disposable hosting indicates a coordinated effort to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9675

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://ankaratemizlikcim.com/depo/sayfaresim/file/99138820707.pdf In PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/68cm75qvejbmc8102m71dp0chv/rugagojazefowozexuweb.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e6a1d8e7c---46509635522.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e4dd09df407---18891723315.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0a2a527d3---tizosit.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/depavawesu.pdfIn PDF document text
    • http://lphs-the60s.com/clients/5/5a/5a84a5cabe7f31a06b4bf99f7e1b7ad6/File/16699598013.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/37liihjq2tnev9nsprlglmhhs4/begadonemobijubijodogat.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/6259770889.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/hjg6rllr7lrqlnunaesr5qfsrk/74368929353.pdfIn PDF document text
    • http://rinsacars.com/files/others/19696033197.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c881268d512---gelabot.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/38307937622.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6edd62043d6903989399ecd0c45695c5/fosulevivupapigewif.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/modedibixigaxoro.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/77317767407.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a67e49717---82848335512.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161024b5d56ff1---61274877177.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/qds85881st0ttin69frjjv690h/sovabebonipoguwijodawesat.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/kumoduwalupekujawaja.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/28652693079.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/muforija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=gta+chinatown+wars+downloadPDF link annotation
    • 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_off0000e292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA4 17260 bytes
SHA-256: 6f9bb1ab96d18b7963f3f4f88f45779670618fa7e67072f05896d84a64851814
font_02_sfnt_off00012777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12777 10460 bytes
SHA-256: 9ab3747cf5c4826902ff592210756245eba0cad4d7b508d001dc1fb10d285ae5