Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d77ee734c0cc712…

MALICIOUS

PDF

111.3 KB Created: 2021-09-15 14:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2c4a71ec0406b521f1132a1960a61b15 SHA-1: 8303a1f50dd366918b51cd471205149446ab60d0 SHA-256: 8d77ee734c0cc712f8e66db3d090b888342ddf2e0cc30c725b922fdc391059ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://queure.ru/uplcv?utm_term=edward+said+orientalism+book+pdf PDF link annotation
    • https://osakadentalcare.com/contents/files/tudodowajutagu.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/7cgithk857co72rgbpfvr89d74/24202304235.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135cecfc9b81---vamerizavimifiji.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/57559301674.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/19948911809.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/ludumelog.pdfIn PDF document text
    • https://tarsiman.ee/files/file/66080101325.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/19ad110f17e2547a5ec7943499a763b9/2528647682.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/xomikizaxazekizewewiwak.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e08c0db933---78883001449.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319ce2042bd---xuditomotazide.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613753576e795---rikizekaxinenamosenewutoj.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/zofemo.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/xeruzipibapufowuxefa.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/36792630505.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210915_140930_130.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/45164971577.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/fipevasoja.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/orh9jbe3mvr6hp4591e2uqjlh7/25705122178.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/fidaromagipukip.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/1754984082.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/fifiburuz.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/jefagubafatekugujidoz.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/pezamarodofof.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_off0001494a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1494A 10960 bytes
SHA-256: 848e4b61776a7e2617ac1406feee9727f8b21b37281588bdb9ba448a9f1aea0b
font_01_sfnt_off0001627f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1627F 20212 bytes
SHA-256: b311f3ae90ca98bfda2588bc8165ac2aa0eb568e0c0c02ae3523742a59f18e91
font_02_sfnt_off00019749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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