Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7610bb5b77abfb6…

MALICIOUS

PDF

82.6 KB Created: 2021-08-31 14:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1654ee884543d744898fda2a3a10da5b SHA-1: 61485d1be0bd277025b15f334c836399bbbebe83 SHA-256: f7610bb5b77abfb6bb8fb889dd2e5a773803f234917d82589a36de28303d4997
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit kits. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://martensmgt.com/business_school/uploads/file/26483800311.pdf In PDF document text
    • http://weingut-suppan.at/files/89942227235.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/wewudotegomidulim.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffded0b84e---20128003481.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/zogad.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606db460aad31---futisifeban.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a038de7e5e6---ropaw.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/13924330563.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0255143d6---fupudusefitadur.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/notiwolabiditisow.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/ganulefileke.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/gawazadugifu.pdfIn PDF document text
    • https://telenovella-bg.com/files/11332880234.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/82597073942.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf22c95db---kafukatagabiwokegudawiro.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/76060945354.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/22510506798.pdfIn PDF document text
    • http://aa-nusd.jp/wafezolawelireve.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a96ec5818b---bodanokopa.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/74779982049.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc2cae9521---pevatezitotenupurowisor.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/bamimosodazatovi.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/junofijibob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=name+from+letter+g+for+boyPDF 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_off0000de4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4E 17796 bytes
SHA-256: eb74933934fe9edfd83fb5e3ec84fee4a2d201d7fd9ff3cca0f8a63e7157db6f
font_01_sfnt_off00010c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C69 10424 bytes
SHA-256: df04b9ca5205c899f4270610aa408b80864a26302eb3d577eadd24a8d653e749
font_02_sfnt_off0001241a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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