Malicious PDF — malware analysis report

Static analysis result for SHA-256 b579a808f1be6d16…

MALICIOUS

PDF

81.9 KB Created: 2021-09-11 11:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4318dd077c37be648e8eae7c1533283d SHA-1: c80d28de2b16c9c807c9600d0c64cae9eb47fa3a SHA-256: b579a808f1be6d1622893425ec01afbae1c93db50f36b516523941bfb6ab630e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating non-clustered link farms on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=save+my+text+messages+android PDF link annotation
    • https://olivier-daulte.com/ckfinder/userfiles/files/86874899973.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/bisulejinazil.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16133260abcaab---58806988926.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/xaradamaxanowanumozinoke.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/zozipobaxizuxigefebini.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///siwinixogowuta.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/38953491150.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/teduzavikexolemoz.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/modorepuw.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/lekidopixenikuv.pdfIn PDF document text
    • https://priscar.com/documents/files/xixeritusuko.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/fulinixufunufido.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/38516028842.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/xiwexagufilebevago.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/luzozeso.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090518060394.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/71369291396.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/bbe08f2dbb106ccc137301bd30d498c0/tuzizozu.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/1266157282.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/xijen.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/losepakujimanedoboxodil.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138ef4a6314c---28238690368.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_off0000d78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78E 10900 bytes
SHA-256: af70beec651790e84ebd23496db456bf4cc2518c1b8c8fca74e6def83a390b8e
font_01_sfnt_off0000f09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 19180 bytes
SHA-256: 79ffdd9cf8d329224de658575ad94314fb697fa865cc139fd40cb5d23bf20c3a

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