Malicious PDF — malware analysis report

Static analysis result for SHA-256 2819a4509b1a1b28…

MALICIOUS

PDF

83.9 KB Created: 2021-09-04 13:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 660ecabcdba9bdf40f70b4d3d598b164 SHA-1: 896c35f361d22c7921736fbfe63477aa8261e0d6 SHA-256: 2819a4509b1a1b287afbcaba01d67d5ef736c1709f5a94fb0fd4cd2a2647312e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d60dce4d7---67874359792.pdf In PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bb5d79767---837673044.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/b60f85cbaeee4086694e73ccb2dac8a9/82886424321.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17f74ea67a---valarijate.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/perenavudutusal.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/novk2ljrfsj78mpit97ni7hduc/80340286725.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/4e3b6d021ee7cbec38762098267d9aea/momosimademimebafibe.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/47329783060.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/rawugulidumepev.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969e83b6995---fifirejogekega.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/zozivomedovevuxomi.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/xaxivitanefereba.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb053100c0---letidozujoluka.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/puwafavulaxopopira.pdfIn PDF document text
    • https://hsse.cl/files/tekebi.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/55749304189.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/vulisanu.pdfIn PDF document text
    • https://birudongker.com/contents//files/67897392685.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608206f5c73e2---xagomezux.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/52497887820.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/88208695912.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210619223610_zk2cp2.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/bewig.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/zavuvise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=camp+david+accords+1978+pdfPDF 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_off0000e6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF07 10976 bytes
SHA-256: caed0d031cf058af73dcd8fa13947042329686ab38df4320dcf8c471a41214ea
font_02_sfnt_off000118a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A0 16108 bytes
SHA-256: 4ae286da9f71163450cc9bb24e4bd04802612e6a792d2ee329a66a4680f743ac

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