Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f187713d103019c…

MALICIOUS

PDF

85.7 KB Created: 2021-09-16 17:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b19cdd3a4fda6bbf9509c659720f7a8 SHA-1: dced67cafb34ee1145b2413b99139b710c14aec8 SHA-256: 5f187713d103019ca29c266df25ce9133485853339c92c6b20af2623b2353571
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to trick users into downloading a malicious file. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://likeevent.it/writable/public/userfiles/file/semum.pdf In PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/domipemifodidazavebava.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/pasukazawufepuloki.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/66477586288.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/93801294491.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109160747461199.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4fcdbc073---bimunuluzuj.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/mawinexumaga.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/85719026389.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109011812351312.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1631190674.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/dokoratetamatovifijowig.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/11223571431.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/61736147968.pdfIn PDF document text
    • http://www.moyekolodin.com/files/kujunatawinaxizewizopij.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/mulibapexenumamo.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/febelikegibilugatamox.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/novanipefikujineju.pdfIn PDF document text
    • http://esistore.com/userfiles/file/15363489062.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135202d88ce8---zuludutajusanal.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/narusaxumivupogekega.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/32525629430.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/2msu8t4iduh32cd4v0uoubu786/21323648259.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/24844999777.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebf5f0bcb9---xusiziledupikaduxinum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=can+you+facetime+on+fire+tabletPDF 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_off0000ea72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10289 10712 bytes
SHA-256: 83e3db617ca938a36794ba16179b7c5c039d81047cef69397a11350dd863bb5b
font_02_sfnt_off00011b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2B 17876 bytes
SHA-256: 1908cb574fc7e4f0d6401995a6189fa14f6bfeb920d212a4b25ebdc56acd85e4