Malicious PDF — malware analysis report

Static analysis result for SHA-256 962db9b8e237e46d…

MALICIOUS

PDF

85.9 KB Created: 2021-08-11 23:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 74074eed5e28ca1922bf3f0b0d5944e5 SHA-1: 8ee36cb168b3fa235f0c4f30f2c4be1d6b5a4e04 SHA-256: 962db9b8e237e46d80632ab931aac5d9842149b0581e335664cf28540e859abc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the compromised hosting suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=graphs+of+linear+functions+worksheet PDF link annotation
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160be8bc581425---gamukupixedalonojuxagib.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac28238726---betumuseneson.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/90665048535.pdfIn PDF document text
    • https://patc.fr/imagesfile/96146161873.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/e2ac0148bd94c5ed8eb957a4f0021dc5/vedexufiro.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06bb54bea2---87824761291.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/2603618835.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/59425417785.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609aec2f419f9---ruwiluvafukimowonu.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/50512646334.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/9164482181.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/24565261059.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/gasufo.pdfIn PDF document text
    • https://ive-cal.it/file/nunezukawitikotebejipoka.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/tedasirimaraziwipunota.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/56014899618.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/97519062022.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/2glh3t7gpbmdufs1k4vhbs6pa7/kutonupoxupawupugibopezi.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/25593862672.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/92ed019519596f8b4c571a194fac546a/43407820175.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/41550941101.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/32828869370.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/fekusupivagitovuvojufan.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/39197882412.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca67eb2a78---medoxoviletowisitinuze.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/91938929501.pdfIn PDF document text
    • https://aitalk.vn/upload/files/20693642029.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_off0000e8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FF 10892 bytes
SHA-256: f44711b97b05c6acda478e73bfe40cd896547764e0c6d1a38df2292f961c4fff
font_01_sfnt_off0001023c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023C 17688 bytes
SHA-256: 379221a7551ba6a3f6cf6e558e176315a616db5fd9435eeafca555cec2ac3eef
font_02_sfnt_off00013128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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