Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49548587ae4b36e…

MALICIOUS

PDF

89.7 KB Created: 2021-07-07 01:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 83a4ef876db53775d78dbce638cedac0 SHA-1: 7d56e42d3e650753e6b0fb3aa3624f870b691054 SHA-256: a49548587ae4b36ec4582d26b7622f852c9b1bec1cf07d83f489907aa907e6cd
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised CMS upload directories. The primary purpose seems to be directing users to potentially malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://giga.sk/storage/file/zitusadojuvabokijogen.pdf In PDF document text
    • http://salon-urody-bellis.pl/images/file/kotikujul.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608aff750fe79---baderatuluveriburor.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/90cc9b8f6b83b7c0d8ae2f2aebd470a4/44129954769.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/61951852109.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086498518e7a---kaxigelirizefef.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/pevesuvakaf.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/9iuubc0e2td15vktejemnaqu64/4764680048.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/rg8hnpv3bkkf33ekfe3g949ql8/84536016452.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/cklrh71qjomsr1qqbvnl22qr72/13935205661.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/d45cd3af9c8e8eb3c98d70388cf30d18/davomebimaraz.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e482bae402---ganetaxoxalunuzu.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/70443799005.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/27195883869.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/sotoko.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160986e2cd4a09---92292853303.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/nenikijolata.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/d17a858f8a969d9b6c25c3ad007f6e17/42581443944.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/fojabumotij.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa32ce530b---bosepuvujetage.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/333npru27lp8j4rda44tla8iq3/fafanipezemawekoxulugefez.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5b229c22868206d952f51bd784f4edf4/zojab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=propinquity+effect+definitionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDC 10600 bytes
SHA-256: dac55bfb75f276d00bb16fa09e5c3cbb29ce5bc2e0fc71395e45e726e4f1750c
font_01_sfnt_off0000f6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 16068 bytes
SHA-256: 9ccb3d43a746bf17a5b07d0805ca48daec8ae8b843b706687955c4dac133dd41
font_02_sfnt_off00010c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C15 20468 bytes
SHA-256: 30da3263313a4e8ac2b530c86e23f658da9ef079916566deafb1b57d8a8271c5
font_03_sfnt_off00014123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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