Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d78177ff14a28ca…

MALICIOUS

PDF

88.1 KB Created: 2021-09-03 04:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b985f981bba0c0881eb03e9bacbc8460 SHA-1: 809503794d1270496c919f8be349aa21d6936ed3 SHA-256: 5d78177ff14a28ca51cc5717d6681ef39778eb31d9f3331d6f7ba47643aab91e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and link farm characteristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://grapevinewinerytrail.com/clients/876125/File/zokazup.pdf In PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebb550f46b---27163122739.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/878116034.pdfIn PDF document text
    • https://bamor.org/userfiles/file/nimizi.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/3286bbedcff5c3facda639f8579b5df4/jeluzek.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/gumuvotabu.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/23888922915.pdfIn PDF document text
    • http://hk-keber.de/images/file/59681617074.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/vaxaroragimubimefuwi.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ffb4b1c3751e600acc4352d673784e37/kotofoximo.pdfIn PDF document text
    • http://caramelitos.sk/files/fatuv.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/01872ead17c11aaf2e32ffdb5773546c/90223445946.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/e4c6fb5f493f3d456b30ee12edc73d94/51846167352.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160853e27f2323---zomufodoguwofo.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1610999f33f2a7---49427184355.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/7678463578.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8dcbd88be---nikuzokawibanubumijarax.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/86505930778.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f40e7f767---wumagewetosalutoxaxi.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/c4d4f5e39012c02bd2460303c87d9c2e/bevuzofifid.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c012b61d1dd---55902642632.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/b8d0618704c635df47a80f10a478f423/nuxepimop.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/temunisejibinovafab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=lg+oled+tv+65+user+manualPDF 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_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 10924 bytes
SHA-256: bb0b23c24cf413cebff8bed4cddf47b8a71b4116830f14f9d51b1dd7128d0756
font_01_sfnt_off00010aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA5 18496 bytes
SHA-256: 21d1458fbabcb880b90c937453beb584e3977f2e0a8d9ffb5d2662829118b489
font_02_sfnt_off00013ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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