Malicious PDF — malware analysis report

Static analysis result for SHA-256 957a42a9f088a351…

MALICIOUS

PDF

79.3 KB Created: 2021-08-06 20:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ca6733084a90e251aeefdd1e32a9b6a SHA-1: 7b7f7c7f591c39b19876e14d16f6f3c637ebd451 SHA-256: 957a42a9f088a3518894f31ffad77aba889dbe7a26663aa5ce8b04df5dbc5dbb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of multiple links pointing to compromised WordPress upload directories and disposable hosting suggests a link farm designed to distribute malware or phish for credentials. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9dda08504---89204830917.pdf In PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/86295071818.pdfIn PDF document text
    • https://banghenails.com/upload/file/tulanikigufifozog.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/17953884283.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/3b37d599193c31ac343cdb6a3833aa81/20786290664.pdfIn PDF document text
    • http://www.toptehnik.si/images/93528898683.pdfIn PDF document text
    • http://kaies.cn/upfiles/2108050931557986212oe7sv.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078410ca17b4---bolawekorukeme.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/64a102e8ab2a37ed4c789a0871e06ba9/99880093335.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/5cpc0pken5ljdr18irq846mes1/zofesesowosarebikutekopu.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160882dce403c9---balosolenapunenusipona.pdfIn PDF document text
    • http://absigorta.com/E/file/35680858479.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/5380739976.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/varifinitunus.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d111bd0a4dd2f79de37516a78be9ab7c/mikulusulabowurowaruk.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/69448991907.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/9564877881.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/pibof.pdfIn PDF document text
    • http://4bx.pl/public/file/sidatujuzot.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904ce45743d---jobowisovuniwidigofub.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6a0a24be7---3138358721.pdfIn PDF document text
    • http://d4squebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/kipusegelezivove.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/6jbgp9q5qdqoaal7noe07276kp/35330256493.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/49396784815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=shiv+bhajan+lyricsPDF 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_off0000d48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48E 16972 bytes
SHA-256: f2469a931da1cbd07f36d505191501b66bf2b901d3276dc560140cda32a107c3
font_01_sfnt_off0000ffec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEC 10500 bytes
SHA-256: 01e4c286b48efe9e5d01f09dfec3b14c1838434451761c16164dba124db784ee
font_02_sfnt_off000117ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1