Malicious PDF — malware analysis report

Static analysis result for SHA-256 355f26e6e85edfdb…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 00:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8df9b3526b27f15e9385042678e289d5 SHA-1: 6ded607cf156becaf5d6f29dac09f89a99766c87 SHA-256: 355f26e6e85edfdbea2c175be50a9c59143423809186293ec437397ce38d8a68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous external URIs pointing to potentially compromised websites. The heuristics indicate it's a link farm hosted on disposable or compromised domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF format can embed JavaScript, and the presence of multiple suspicious URLs strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=word+problems+of+fractions+for+grade+5 PDF link annotation
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e311e2e2956---retesoretuwesuju.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/67735222398.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62aab4609f---62063399697.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f7479f41---33635594994.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/posofufi.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/91827091313.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/qstv9avksmqdu2mt1tf6brncc4/14725214177.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/2fd14589b775a873fc10d404f063dc5f/lebujunogavetidunipipawo.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/92392384841.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c610b84e60---wedofudizenelaxot.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/69933726152.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/v1h5sdac0qkevrt2m84rd91r23/xelimasosejeraxiv.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/12e5af3b39813d9342e8858d7bb04dab/jasemovufojavuda.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf076dd3bf1---pamuf.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/r3n8ubrt14sg0iodlg6ip53bi5/pufuxukatimederomew.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/29058140164.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/20eafdc446dda9d0d6c3c07aa3966170/4945300953.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/zomevokugilomomurevo.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae98267d46---bujixedupitijuvadevowule.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1621207391.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1fda1e838d984def69752c6d8a138efd/kikewikenexunujoxoteleres.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/bilivufosiposuz.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/gemitepasuvari.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/19420506088.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_off0000dd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 11232 bytes
SHA-256: 3204115b506b04e7bec84d95ea9373980ecbcf61f286645c711cf4136888bdb1
font_02_sfnt_off00010f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F96 19796 bytes
SHA-256: 7208f38e6434ec180f6d6a18d3f0967757cafa3428f8e1c61213f4f6b718421a

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