Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d82210db0a25e77…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 03:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aaedc23eea9bd8aa157b49aa64598b67 SHA-1: 9e6b4f23461f4b39d06a30d6750677cfa9b43d19 SHA-256: 1d82210db0a25e77ad2235b9ec41d9a438ded1faa79641b44eefbb218c45cbc4
244 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The heuristics indicate the document contains a link farm pointing to compromised WordPress sites and potentially a password-protected archive lure, suggesting it's designed to bypass security measures and trick users into downloading a payload. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=flatout+2+for+android PDF link annotation
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d376c81e2---javedasakesumotazigizudus.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///wowubajila.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/diwofujanolilisalumiti.pdfIn PDF document text
    • http://ellev.fr/upload/files/98959551276.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/gapuzatulerizikisixapaw.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/disutekugulu.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/kixezipa.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/25944849624.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/6f526910a74b4655feec803727c1f0f6/denabopagapotad.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/68378304909.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/52968160777.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/62178795977.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/duvojaralegupogozumido.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/vuvapotadusarozejobokinuz.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/rurubupukuridafisuse.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109130027301241.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/fujoxafirapateviporot.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/nisafare.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/kekuwiz.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-15/20210915174820657653.pdfIn PDF document text
    • https://alohasafaris.com/files/wodoxizesigikunibojoju.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/81099001801.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/vafenisumefitos.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/5dabae1cc641a1a3bef47e5c95c55a6d/66030455399.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_off0000cb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38F 10244 bytes
SHA-256: 7d7f697b5da3f154f03ad1126abb2c004d14d7608613b05568e41cfa8ff47710
font_02_sfnt_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 18476 bytes
SHA-256: 0c474c964808cc5d34289b79e0ed51e2d332a94d50752ec843e32a147e6a32e0

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