Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f09e02c51ef2c90…

MALICIOUS

PDF

75.1 KB Created: 2021-09-01 21:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1eba59e2406f563a60a7aa0c96a9c9b5 SHA-1: a2b90f4fd68e0b77a190d5d3244508162a60966d SHA-256: 8f09e02c51ef2c9097ef8913f216044a77d82a0d0396cff69439ac659385ab75
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests it's designed to lure users into clicking through to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://neksav.com/upload/ckfinder/files/subitekuw.pdf In PDF document text
    • http://chinoboxingclub.com/clients/36032/File/wixoxal.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611bfdca4972c---22101032784.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/kixulo.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f0faaeb4d---24226599729.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/sojumijedidaxemigupeb.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af5cf3aafa6---29227569913.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/jmve7cqaeugqsookk5liliq1dh/82739168508.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083da9754567---91162687385.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/6299322607.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/gebupemurabitekimaworoz.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/fbd30b6125eca4757584c365279060de/xekebuwufogiseva.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/07a24ff583004457e667398c850e3e26/legorologabetosed.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/994907410.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/39155285627.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb82972308---potubusaxujuliren.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7959a3b7d---ronasarozuzuwisetumalezi.pdfIn PDF document text
    • https://hiroyoung.com/data/files/10642140030.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/dinumaxomawonowemot.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/94338721746.pdfIn PDF document text
    • http://chichen.asia/ckfinder/userfiles/files/wagaxibokejibifelikot.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/8242420810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=a+thorne+groundworksPDF 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_off0000c0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AA 10484 bytes
SHA-256: 585fd16f502cc9fa8843acfc1baf4977e6b3b3ead3087bb077249aeac38d4523
font_01_sfnt_off0000d85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06F 17532 bytes
SHA-256: b0ba44158956b62498b343287acee43cc86fade8c486843563847a4252d1bc7a

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