Malicious PDF — malware analysis report

Static analysis result for SHA-256 81aa0129144a3a2d…

MALICIOUS

PDF

85.2 KB Created: 2021-09-11 14:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ea21f2a32e075f7fc07535a06e5c591a SHA-1: 7dc137f6048b5fc93068a3fe92cc23c7a6ed6235 SHA-256: 81aa0129144a3a2d1ff09abe5b96ec5fcf896209999544e0a90815b1d0e4aae7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which are identified as disposable or compromised, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://traffictkt.com/viking1/uploads/files/59412305976.pdf In PDF document text
    • http://lavalnerina.com/userfiles/file/xesaz.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/bepor.pdfIn PDF document text
    • https://stopserv.ru/files/file/kulewozekafukikifalivu.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/fodaletazativ.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/ximuwusexi.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/5176935700.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/82042052563.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/ruzitatoj.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/69305024261.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/vatunaxifosemip.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/27093420735.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/50536991946.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/domirenodab.pdfIn PDF document text
    • http://risme.vn/files/25943858901.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/73518093374.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/27263924621.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/92516901252.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369bc31856b---38831153880.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f165962110---weputezobamiruwuligus.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/u0nuccqc42ahcg5l7snm67qc5p/parilizikani.pdfIn PDF document text
    • http://theponghop.com/upload/files/23363351828.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/60462693600.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/39946452805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=powerdirector+remove+watermark+apkPDF 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_off0000e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 17704 bytes
SHA-256: e9d78a563f4484131c073fd463e8bb06abe40d5107b6b9aa81a45779f6bea34c
font_01_sfnt_off00011664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11664 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7B 10604 bytes
SHA-256: b617cebabd0dc59b976a0d74560f98c6b0c0c844142ae1de37a0193b836cb8cd

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