Malicious PDF — malware analysis report

Static analysis result for SHA-256 314654ffab5d9766…

MALICIOUS

PDF

87.0 KB Created: 2021-09-16 20:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec220d4a91918c50deb10ecebff7a4aa SHA-1: 7e5f268302a6a7c7c5b9dbc8d3b496cb13ddc926 SHA-256: 314654ffab5d97669cd09df645b50049718f2b76c650c4afca703ec48b10b3aa
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests the use of compromised upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://drafthe.ru/uplcv?utm_term=eyecon+app+download+apk PDF link annotation
    • http://czyxchem.com/upload/files/46618216814.pdfIn PDF document text
    • http://haai.org/upload/file/nalolejif.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/wixavomabadojuxudoduge.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161340fa8681e6---10350388600.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc149c3a52---gugixomaluvinogugoxipu.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/8d0c2c47a39e0b4e7ede997c9244d4c5.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/funumibi.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/gavowapenadegabisi.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219924971553.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/tisozaxepuzadabumejilo.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/wonis.pdfIn PDF document text
    • https://noddy.nu/images/file/sinonapezunasinifite.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161337a1f5671e---98019084091.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138dc2f7504e---22715120341.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/15491360198.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/gaponovanaru.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/68135765485.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/tibawuwexexewodaniribiwix.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612edefcad865---lababefebotepivi.pdfIn PDF document text
    • http://web5gstore.com/Files/files/dapifeket.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/70016218595.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/vuwove.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/18406821655.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/pegojepege.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/14804258015.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/86389df7c1c9a75cce145203b08fc0bb/30446592675.pdfIn PDF document text
    • 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_off0000de2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2F 17092 bytes
SHA-256: f5edcf2e44a726eac2dedf9d0c32aa7dcc0a5302b413d31d3f5df27ed97b7a25
font_01_sfnt_off00010a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8F 16676 bytes
SHA-256: 5cd4b2546d2dca35e5f740e663d12f19858e21a7948025c3491f1821b8d65a64
font_02_sfnt_off000135f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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