Malicious PDF — malware analysis report

Static analysis result for SHA-256 36127e1233f7baf0…

MALICIOUS

PDF

93.7 KB Created: 2021-06-29 15:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6ea7794e94125b0b486a8c103494319 SHA-1: f60db0344285077afb21fb3cbba8e7ca62588edc SHA-256: 36127e1233f7baf021a2be91298e7606753deb799b99116038d67ea5039aba3d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The heuristic firings indicate that the PDF is designed as a link farm, likely to direct users to phishing sites or to download further malicious payloads. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=bananas+ielts+reading+answers
    • https://rivaflo-south.in/userfiles/files/84312554915.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/pizububuvu.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/footglp3dqv29gcen9f9qb1cn5/sekiguxovalobux.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160756e146a6c7---61850976719.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607865162f1cf---65851132518.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ad7b0daef---naruwerilavupuge.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/cc454c184ec35d0a14b0ca7143e9d955/33957376571.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/6e1f535238c2e14b787e5f74d7fffd99/53865354027.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840df222a42---78925730204.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6ab1d76dbaad377fdcc47cd2416abd5/26408620651.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/482099621ce50e4e414786f3986a3d1c/fobafimekibotugewotu.pdf
    • http://asckhn.com/acskhn/userfiles/file/mazir.pdf
    • http://hytechplus.com/userfiles/file/wagifovebokowuwadu.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1886e2b57---26139503112.pdf
    • http://i-daa-wl.de/userfiles/8884618074.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6lel7ss9ba45qda2qqtj97ta34/tabifazekepuvugowikun.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160978cc807ff2---fokifokakade.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb249ada48---tosuxapaw.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/453b0ba9ba29a4b50e5a1006b5ebdefa/85935974997.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b308107fe29---welajemajimolimudi.pdf
    • http://savitapiti.org/ckfinder/userfiles/files/41143241223.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/83948546663.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a77d7b11d85---lozofelabenixur.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/d2d1436f06e75847452034759a4a4590/34135323657.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db84d98668---26370723290.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 16792 bytes
font_01_sfnt_off0001237e.bin
65b2a8f4e33fd6154272a9df0fe9163e4fa0b256b09a2da5aa936a9729ab931a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1237E 17716 bytes
font_02_sfnt_off000151d2.bin
67ae15bf9d51cd6c111e8d182b362c95e1b670b679e6533912defd82432dad86
pdf-font-stream PDF embedded font (sfnt) at offset 0x151D2 10444 bytes