Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce718ba18fd677d7…

MALICIOUS

PDF

91.9 KB Created: 2021-07-03 14:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc8f8d7b2dd969d1734e9374fc33d36b SHA-1: a736007eef914fbeebd4f25cd237305310556ac1 SHA-256: ce718ba18fd677d7030ccd6274c7d9521b63a7e1e0705129c64f369b34c3fe7e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites hosted on compromised CMS platforms and disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://krisoc.ru/uplcv?utm_term=list+of+words+that+start+with+c
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/qmidlv16gal7d25sfbjd1ptbc6/lavomalebarinaduvip.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/po5ae3rp2o0l65tei45vnom9es/juxalutozi.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609f05bd76b8f---kavuweze.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3ad431339---relirokiporimagi.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/9egbkeb6pgq8f8marfcu6a1tah/28242175602.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/fe90d99dbe412a3b3cb43495446bedb3/nepekivoferavodito.pdf
    • http://nexxosrealty.com/userfiles/files/zatilifoza.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/a01106a28f0733e2d5fec0c4b686117a/ludobitir.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/3fae718973883af323816259b91a9852/31246695678.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/b794afb15ad4a0901d5693e800b6af2e/wunenuwozis.pdf
    • http://daehwa.info/uploaded/file/21648159511.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd75aae8b3---80189906146.pdf
    • http://www.cafeinca.com/img/public/contenido/file/45511148965.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae56459ea---duzizi.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/hkrjg3dig2dg074qik9hmj1bkh/ruludejigokalewakadu.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bc6aaf847---71519022681.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/7237546263c51d6ff683e981aa1c0675/82842630381.pdf
    • http://duda-tech.pl/dudatech/upload/file/65303682995.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/xumeg.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/vh3kufson6qrolq56jn3it19al/jimivenas.pdf
    • http://archissimo.eu/userfiles/files/41454878259.pdf
    • https://airshow-bg.com/file/82966518236.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/e5q3nlv146c1ubb3mqnub3r0cg/40517667996.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_off00010506.bin
3f8496eedbd338121e6ce57187bfcd5e13431e60f94ed8d85d4b8fda383fd19c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10506 17260 bytes
font_01_sfnt_off00013157.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13157 16792 bytes
font_02_sfnt_off0001496e.bin
bdb0948656347c3632361f6df322067d623cc09ab3ab190204fff64d6dd6bd72
pdf-font-stream PDF embedded font (sfnt) at offset 0x1496E 10336 bytes