Malicious PDF — malware analysis report

Static analysis result for SHA-256 78081c1fcffac84e…

MALICIOUS

PDF

98.9 KB Created: 2021-07-15 11:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2f5d4e1cc2e78e47850db7884e040177 SHA-1: a71484408124913578d49c7080c4fb5744c9f6c6 SHA-256: 78081c1fcffac84e8a4f7f59534c2591f9f49162e4753222ff998c678dabc04c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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 https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/m661d12qu25silt35lg826lreu/4537751975.pdf In PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/dof8md5eeheih7k2fop9mq191l/mololupibire.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/nijid.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607689b40a55a---76511041765.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/58453984944.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cc7a665e3---42779105742.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/bdea30f24fca81c13e1672fa90514a3e/87579215575.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8708e3c1a---lenisoretasifoku.pdfIn PDF document text
    • https://oicenglish.com/imagexx/files/tomejiwodibit.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/4ea831bce121066f680558b722074dd9/zolegaresa.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/14005699112.pdfIn PDF document text
    • http://redactron.com/userfiles/file/wetanemuberamogavoloweza.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/77213826457.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/3b9132df2ba1154e010e90f031765530/16368001373.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/kavuvanituxajez.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/13830061341.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbbb9d3a33---98999072117.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/luferamubavukogewogev.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/vemijiporipadogor.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/69592932453.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/3nl8mgh4lf117hsvnegrq2ejbp/10871692410.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a71bf28c8---19183305503.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a728f3d43bf---dadupesijid.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d6fb4934b6906237158bb8733a602197/gefofufiparilesom.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a413dbca503---95521934230.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bc0f3548d---xanozavazetopaledabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=top+ten+fastest+dogs+in+the+worldPDF 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_off00012162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12162 10828 bytes
SHA-256: 2042a64708831bd7847e36471abc29adba541c4772398ba139d3068a2114482e
font_01_sfnt_off00013a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A28 16848 bytes
SHA-256: 8ed1e17b03c5ec6190f622094aa193c1cdcc6c5c7607e2c01ddc65ba735fff64
font_02_sfnt_off000165fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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