Malicious PDF — malware analysis report

Static analysis result for SHA-256 844ff05f632ff436…

MALICIOUS

PDF

91.0 KB Created: 2021-07-02 21:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 54d3be4df694f3df068b891d1dcb9027 SHA-1: 26ca2f7834ce740d6b00b7d7ebbf41cdffa94fa7 SHA-256: 844ff05f632ff436c96a9e1ea1074b79210c1bcf69010c340e80b60b99d5eca5
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious content. The primary purpose seems to be directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://alexlunacoach.com/img/editor/file/6472072323.pdf In PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9ae444155---baninu.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mrmbbvde7md43hmf962i3qd564/11249327760.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd8bdd387---89800992794.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/nokojaxurazufij.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/juvojugovokonegobekovavix.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/omq7foloo82lh88qj4lbaitguh/dedekopujajagegirodebizox.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070133cd7e87---kojuzawovakuvibefikumakes.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16099e8adab9e0---gifedifudewafokemijagud.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/2offvsgljh37cva5tosgr2paqv/38907002216.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bcad03b685e---karolumodulewikalebadat.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/lovifamidifesosoliwobomu.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/15a1006528a79ec26c047f6d5921e699/zosefilibusidijaviwe.pdfIn PDF document text
    • http://clingac.com/d/files/29699624151.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16090f1a733083---lisenozeneni.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/jikelesanu.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/71182753942.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/bukowotufurugis.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/917ff2d5ca2a024157e59f031f482c81/todaze.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/f0aaf1b997c375297fa9fa47502bc32e/ziwaguvivawupotojo.pdfIn PDF document text
    • https://hocngoaingu123.com/upload/files/xuzuxujatubadegefoke.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095e2b2a69e3---31349691789.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/gulaxitifemurevo.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5ucg62bj267uftiakpuiu8gpt7/87400519676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=whipped+shortbread+cookies+with+chocolate+chipsPDF 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_off0000fd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD56 18056 bytes
SHA-256: aba2661ca66f90139780c521a51b6fa5b2f7a9ce9c41223ce80925626fbf0112
font_01_sfnt_off00012d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D31 10820 bytes
SHA-256: 972a743563d812fda5be2b1e6f75846c6618223a60cfa1441bfc676604aa0532
font_02_sfnt_off00014629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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