Malicious PDF — malware analysis report

Static analysis result for SHA-256 d097979de9f00f76…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 19:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6fdd4b32e4ad75ecd359618fa547f227 SHA-1: 5e8abd567cb18bdd89b706838b09fffbf77d26fa SHA-256: d097979de9f00f76804399061d6bfa50c87ab3dcf5f5e786209faa138aa12f4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised websites or are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary goal being to lure users to external sites via embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://megatex.ua/images/uploads/file/jisowuguxatuka.pdf In PDF document text
    • http://pijntherapie.be/uploads/files/pabenorasiwimu.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/16423280171.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/51736864158.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/42219803839.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/pivipujowubulukago.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/88579896313.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe205f3f95---zopevajazopekaket.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/zugezaxatiwulibowifufore.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/tevezuxaxomuk.pdfIn PDF document text
    • http://cityfate.com/files/files/18897521470.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/mofukizajo.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/ruxujexoja.pdfIn PDF document text
    • http://ranjoysarkar.in/FCKeditor/file/11556648026.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/7637081990.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/kuwug.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/jovurizawiminu.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/kupupob.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/nekarokod.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/20169371313.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/57063802160.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210912162155.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffc56ac1c6---55012796926.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/c8f2abf45d4a4d63cc1dc2c1825bde7d/50886896987.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/bidalex.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/34733895823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=picku+for+pcPDF 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_off0000daa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA8 9956 bytes
SHA-256: 5bd0bc1df400adefedf3ddcbc27b60b2fdd011a023579af88dc951ca9c4abb24
font_01_sfnt_off0000f0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C3 17832 bytes
SHA-256: 10b434ffa1864981db32a528acef80ab3278af0d63fccfe60465b974097d241e
font_02_sfnt_off00011f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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