Malicious PDF — malware analysis report

Static analysis result for SHA-256 db58abef11065eff…

MALICIOUS

PDF

93.6 KB Created: 2021-07-01 00:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4d3e43573238066bff63638523e5e92 SHA-1: d1cd7fc0987b6901459d5e01a910ac86e6e1196b SHA-256: db58abef11065effd4a5c84b9abc0635662a38c87bd0e2f8ba1ce41ba227c6cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/836dbb3b83d4a0327fccfce6e0994cc1/4842908119.pdf
    • http://iltorg.ru/upload/file/nugawukomolibosaruvova.pdf
    • http://trustarshida.co/cache/fck_files/file/80353674026.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4859a6fed---17418399486.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee4e7cc67---41821889280.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/p36qpdojvsk2k2qcljo5j0drrl/jexajejusuwisedeja.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/8f6a5eca24a77cda05b85045f95d57b9/kokagisasojawim.pdf
    • http://grandrosso.com/js/upload/files/gusigitodizuliworin.pdf
    • http://bakoca.hu/files/file/zekapebufipukawerob.pdf
    • http://darec.sk/files/files/7008989822.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ce3lces7guhqrdluevlu533btp/34521915587.pdf
    • http://ciccioinpentola.com/userfiles/files/pisuvosenowesukuvigutoxe.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ifc3e74qmfnhbfaifbf2f350v2/xabagopatekumivopu.pdf
    • http://lyzebrno.cz/userfiles/file/saximapoli.pdf
    • http://maility.pl/_ADRESuserfiles/file/6684255626.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/1decad7e856d7c7a88e09a060509b299/nexuwalikigipabelulak.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160af2c412e2e5---72969157781.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c281ab96dbd---kukevomuletiwuvatepaludis.pdf
    • http://elturo.ru/img/upload/files/21505285624.pdf
    • https://infrastone.com/userfiles/files/51002586356.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+do+you+call+someone+who+does+odd+jobs
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ab2.bin
ed9189ec5281863f8efe5c44f73f22e545f331da944b1b85a47359165829ebcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB2 17304 bytes
font_01_sfnt_off000137c2.bin
96f5740996dbe065589a668bb07461d2426e59ae0a0067fb79d3449f0b5a5d4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x137C2 11004 bytes
font_02_sfnt_off0001514d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1514D 16792 bytes