Malicious PDF — malware analysis report

Static analysis result for SHA-256 4382b132c72cf83b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-10 14:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 35c96b594848443f941c55eb2781e7ca SHA-1: 9645f666173876a6e1201577e66084dc721205ba SHA-256: 4382b132c72cf83b78fd1641dc6d762886aa6d3ad3bdd6a4c9cb01ff8b5c929d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as a link farm and potentially malicious, with ClamAV detecting it as a phishing trojan. The embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to other malicious or compromised sites, likely to distribute further malware or conduct phishing attacks. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to facilitate these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161331614594c4---vexibed.pdf In PDF document text
    • http://njxinbell.com/upload/files/duterisusejotopuxi.pdfIn PDF document text
    • http://royalgroup.at/tmp/41455065322.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/fokavokig.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/15348329854.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/92852023386.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/fa3b168a154a32b34d01b69593ab1230/fitebumu.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/86529789673.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210902/file/70535037918.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210901140958_l0ghp2.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/83021668191.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/gubudo.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/dalajukema.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16133c1d983ac1---66997300465.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/fenexorofuwamufisit.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210904054821.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/tewodafugezejofake.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/zimov.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/12035546190.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/92057179355.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/99648423979.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613479b2e1d98---91498664105.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/67772863943.pdfIn PDF document text
    • https://preciseenergygroup.com/media/4540678679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=easy+recovery+essentials+for+windows+xp+free+download+isoPDF 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_off0000d60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60B 17776 bytes
SHA-256: 4b7f4225bb3143fffed63bacb2afb84e297763ebf7f520411eb7343f5b774109
font_01_sfnt_off00010433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4A 10964 bytes
SHA-256: bc75f761b8b1778a7685f25b7995a802dfcf182b4541375ec53c24988fc09064