Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e50530ec48f7605…

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 01:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0880f189041a787a6530da2ce1bf43ab SHA-1: eee78df51c0262ea3e27aa7f04aa974284c9be5e SHA-256: 9e50530ec48f7605e03fe01f17c058ea99b290f19553e69b37254f74f710d8ce
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://emons-verlag.net/testarea/cwsCMSlight/media/files/xusijewubivekodibazodali.pdf In PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3ff6f3513---tafemitoliwifulafibe.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/91131942474.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fb812216---21699250526.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/42844473433.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/kmijc8u24m9ronkbqq6hsj87kb/zulilefamuvigogolixas.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a27e4d8f3a---tejopovenijesomurefovajux.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01a9ca1260---tinamitisajawa.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/dogizisajites.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/wabiguremofokoxejuw.pdfIn PDF document text
    • https://rcot.org/userfiles/file/54109488242.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/1f610608c2e037485bf8dd97ec939d83/3905973313.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/69404615230.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/961eee33c9b1346918dd46e32411185f/titero.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/sitoweg.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/11b5416251d4d35386a4c5b9f355a1e3/rumujepewisuvujefokopu.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/8856858063.pdfIn PDF document text
    • http://peoplefineart.com/assets/202108/files/20210806220514937304.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/gdlqksnga6hgbec0768c6jqdqm/pesipovaxule.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612daa8c0f486---gonedewaxa.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/51113758232.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/idpf77rg4r20manqhupjosbjn7/dunilibasadelapilimofujol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=professional+skills+test+literacy+pdfPDF 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_off0000d864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD864 10820 bytes
SHA-256: a1f0df93b84d3a501bf1179a7c7f67d8b5d3a657199717a6be245839b5e6a6e1
font_01_sfnt_off0000f183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF183 17240 bytes
SHA-256: a312daa6cb53b1ade68e3622d9553e3ec1cb0d783cfb81cffb4092c5aa07a885
font_02_sfnt_off00011e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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