Malicious PDF — malware analysis report

Static analysis result for SHA-256 3964c1705a600120…

MALICIOUS

PDF

87.0 KB Created: 2021-06-30 11:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4b06f9f32f2526c05e1bbbc9c9c9a2d0 SHA-1: 4d2bd45cde33ef994e2e4302255aa1b95aeb3f11 SHA-256: 3964c1705a6001204908b0c635766d37908ec8f761c2f3b6a246209334736161
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV also detecting it as a phishing trojan. The primary attack pattern observed is the presence of a link farm hosted on compromised WordPress sites, likely designed to redirect users to malicious or phishing content. The document body is unreadable, but the heuristics indicate a sophisticated attempt to obscure the malicious intent through numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/86ceca35259376caa41a4f0b9aba57b4/99538013739.pdf In PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/mofidikoxodid.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/gilaxibapixupimajakewed.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/ruwupesuzaxakofed.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/dulefewoveforij.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/r8f1t4hn10iv8h2letv7p22sh1/rewojezoxum.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/6cedl0csl0lfilbn1l9ojiss95/kavep.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/b35d625ae75d6e3261b13471fb190275/getuvaseb.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/xuvadesuwegetifagonuvi.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/371f67e77b8759b39a18c6a1c5b94eef/xofufajafet.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/j7i0f8mm7hgdgsd3pv7gbs9096/16156712942.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/66550419634.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/101412051e9ba14c0cccca3ac7883d1d/newalugiga.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/62155164128.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d55a35edd---garepuna.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/34807088640.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/65273396640.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bac0f995651---xoboropixijokamotawejo.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/kefisarejokutojopise.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708ef5ad763---jibinorazuzakuperup.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210610035907.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/tuuchsqbpj47llllrkcn886j54/zoribaxujusoxupesibo.pdfIn PDF document text
    • http://cloverdiamond.com/file/16565444160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=horse+like+coughPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 17668 bytes
SHA-256: 09367d28a9522205f84e7e9d98abe1c3dd8af49cc0c39f21cf2ab3d25519e7c9
font_01_sfnt_off00011f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13781 10328 bytes
SHA-256: 8931dc930986dad8a55c2495bbaff2f69ac67cf865e925a061471bde80876a21

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