Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a966373f98ca9b5…

MALICIOUS

PDF

85.9 KB Created: 2021-07-31 20:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 13bf4a80c4704d8be2c5b48619974a81 SHA-1: 5beffde3beef291644ec50aaa4179fe5ade1efbc SHA-256: 7a966373f98ca9b5409c3f49c100c9f394266e0b39af6064fdd3c544ea473517
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. Static analysis revealed numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. The presence of UTM parameters suggests tracking or redirection, common in phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://medvor.ru/uplcv?utm_term=mp3+narodna+muzika+besplatno+skidanje PDF link annotation
    • https://altonika.pro/files/fck/file/88866758587.pdfIn PDF document text
    • http://imi.vc/upload/files/15709552071.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/44988031224.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/87737007345.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/sewoveroredasinetosiraxe.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/97187050273.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rosajenixaj.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/10749178222.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16099ba0deb28b---14061389331.pdfPDF link annotation
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/rinexojizikamuxadi.pdfIn PDF document text
    • https://dacola.com/upload/files/lidumuj.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/56085228664.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/99394125833.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/jodagonepesunoxuluve.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/2299dc32b2015927b8878f253048f917/18846216557.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/38254514778.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/d0a525e7bed5eb6d1ec7d609202c393e/73405178654.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/potekenozagas.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/58076757134.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/xewirarebowasisanud.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fad3d77762---18134594163.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077409d89c70---vemunurosejak.pdfIn PDF document text
    • http://teraval.cz/res/file/poxawonasutitonu.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_off0000ea0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0E 17956 bytes
SHA-256: cb0e663b197ea472108bf6d579c5c6919a7f4f79d42e0655825b7d1f08516afd
font_01_sfnt_off00011741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11741 11240 bytes
SHA-256: 5b797973b359018f709e2d0558883497e178e128449b77526359a4b25e646cf8
font_02_sfnt_off0001315f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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