Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e456f6e465ffa56…

MALICIOUS

PDF

86.3 KB Created: 2021-09-08 01:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d8f0253fdc8d46c03f1e6f94ace3cf5 SHA-1: 7250b11c2d6445d154a802ba613c3aa5be433724 SHA-256: 8e456f6e465ffa563b65c1a59c0da2d96af2fd93c9d7a8a382be857debd80f79
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. The PDF structure and link farm behavior are consistent with phishing or malware delivery schemes.

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 http://canxetaidientu.com/images/file/wagewi.pdf In PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/8916c839dd30bbbc9e598cbb8635f1f2/91567709777.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/masowivonodexinedenepoz.pdfIn PDF document text
    • http://francisfamilyreunion.net/clients/870293/File/fupitusixolelow.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/di2m188i0kb0dd4fislr64uj82/rififuruzobuluguvegiveja.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb508f18a22---85617659938.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5328119103---judupiwamojosi.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/1ef2eef684842b55a1ebe1bd04d6070c/tazirukaresipigefew.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607eebad944a9---jejigavobatobivowixiremi.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/xadatunelasenuf.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/23495807643.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/71157067157.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/sarabokutebole.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab8e471914---75834838642.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/varejug.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/97606763292.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/bamewolefowosunezizo.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/44997989538.pdfIn PDF document text
    • https://kuepancong.com/contents//files/45583179589.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/wofonuk.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/1bbee4551e37000ff3234aa32e964f38/79460792593.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ff3b8acfa7ba13c9c524ca503ee976e/81286352933.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/bexakivumopagi.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/ropog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=english+worksheets+for+7+year+oldsPDF 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_off0000ea64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA64 18436 bytes
SHA-256: ee6af67f6f5c604eb13583924e9822a0f2db3bbf6ab5fb8f4a2641fb0f1f245b
font_01_sfnt_off000119c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D8 10960 bytes
SHA-256: dc1d091585d67eeb980b4015bf0b07572d13f78cd801a81bc180fa559c9e85b7