Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9656562d2aac2f0…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 07:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 98c9245cf9665db199bf58f75da8d241 SHA-1: 6466a90fafcbf414603d68c3785eadf224b71b35 SHA-256: b9656562d2aac2f0c6eb5ece7e8ac1b2bbb7b16624d030a825f387df1feeb98b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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://aiswaryamatrimonials.com/fck_uploads/file/sajupigaz.pdf In PDF document text
    • https://temahr.hr/files/bubomedurufu.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/94555729666.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/jozodamesemoporulumazasev.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/dimijilabisu.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56269395bc---sojofavuvetas.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/s4u66ap1t00t2ci9v5u4oqflr3/22085383901.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/9f4b16c7f7bd5ba979ff3b69c44225ca/mopukiwokizu.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/75368319680.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/47690048755.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/64141877479.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/vm2t6dfjsme1a74tjtv2fh5pj6/xojetumaxekipudodus.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/wuxedejave.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/nuwomof.pdfIn PDF document text
    • http://aplus.to/userfiles/file/54452574635.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/nenukavadegilakovixetogug.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd75aae8b3---80189906146.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/56089522179.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/sivolabozewiraguge.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9e581f180a7debccf82d9bd08d072b6f/xivozubowa.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c1d0bcd024e15654f0dc3a89978dac23/14453704020.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/rogovasazunat.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/20503493296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=maquina+de+coser+antigua+singer+manualPDF 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_off0000d891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 10952 bytes
SHA-256: b5d17f55ac0e665d058efd80c41402bf6579a698a9ca038c8fc077c39ea25120
font_02_sfnt_off00010981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10981 20304 bytes
SHA-256: bbdb6ffa46405c2573fe5701382ffd1b80becdfb186077e61fbca2de5a3b26ef