Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f565202688555d0…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 01:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ffe5491d0d16aabe892b388b93daa494 SHA-1: 87df0dc967ae0a196cd76f8d2af64413a80083ae SHA-256: 7f565202688555d0e15330bf8b0e767542e7d1c65660d1c65e59181825e9f947
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to manipulate search engine rankings or direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://mwflower.com/upimagesfile///zajaguli.pdf In PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411a9354855---59166710895.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/7951103668.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/15136395264.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/napixixaxasipolitopet.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613506419639b---73552018376.pdfIn PDF document text
    • https://kapefashion.com/files/files/zujepan.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae664d1f8d---19432046197.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/nukojokegovudifinadi.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/66433161371.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/mufalazerowazevin.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/pewofiwadepegotusaxol.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/22664481232.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/17064043992.pdfIn PDF document text
    • http://industra.sk/userfiles/file/1871205245.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/nekulofakegunuji.pdfIn PDF document text
    • http://24cvety.ru/upload/files/kexozugudesu.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/37688169989.pdfIn PDF document text
    • https://negaratoto.com/contents/files/totejewovig.pdfIn PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/27046039806.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/kiwipubedilizevamuz.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/28917372166.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/6df1c15c6cde7c5c4c102b5f5c8a1957/8427444419.pdfIn PDF document text
    • https://solturism.ro/images/file/51475822745.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/42205375065.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/vunozifagolidumon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=to+do+list+app+for+android+tabletPDF link annotation
    • 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_off0000d112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 10596 bytes
SHA-256: 56d7aa95d5ff29a16e82a2f4d42db52d27749e09271b0b9150a01129b30839c6
font_02_sfnt_off00010132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10132 16800 bytes
SHA-256: c8177533418432e94efaacb94c436b33607c59088a0b46ae97faa48e3563c976