Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcfef7d0ff9c11b…

MALICIOUS

PDF

88.3 KB Created: 2021-09-18 02:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b307292b61179bc337dc4218c40a259c SHA-1: 09918b73ee3b3ce49e2069cd30164dd0f0996bb6 SHA-256: ffcfef7d0ff9c11b06c0881f9dcf8092a6dae9dc2adcc1f3982e552feb42d995
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one that masquerades as an 'apk installer'. The heuristics indicate this PDF is part of a link farm, likely designed to redirect users to malicious sites for phishing or malware downloads. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=apk+installer+for+windows+7+32+bit PDF link annotation
    • http://www.nbc.com.vn/ckfinder/userfiles/files/40495059384.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6c781134d---43363117149.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/mepif.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/84619618667.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141772ca0097---80933825331.pdfIn PDF document text
    • http://ebus.cn/up_file/file/jukatiseweroja.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/13229957357.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/edbp2a4berv3hccvggcr246gg3/dajonigimumatalovuz.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613db2572dffe---terilisivuxenejidukujoj.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/12995200121.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/35194234989.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/68888118557.pdfIn PDF document text
    • https://citytrafik.nu/images/file/70377801262.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/232f4e0ce74ddcb985836208fd6366dc/zajisipebuzodego.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/telujukiv.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/5760624940.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/fivepezo.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/majilunevufiberukogi.pdfIn PDF document text
    • http://cycling-software.com/files/file/4361172392.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/mewinafinewositir.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/bonolelenexigetatebi.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/nabikesobebezer.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/15057419981.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/zuwezobubij.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_off0000f060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF060 11132 bytes
SHA-256: 3ed5f9c898b210ee77cc86febcae674851cc272e0c4a14a532b3ca305609c208
font_01_sfnt_off00010a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001229e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229E 18808 bytes
SHA-256: e479837b1260728a8633b0b09d58bec1b27b96e2f8f783fec8affbde76bdb76e

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