Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c77037a65860e4…

MALICIOUS

PDF

67.9 KB Created: 2021-09-08 02:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 77e6530de41244a9a98162e60f0dead0 SHA-1: 0d620a40cb6f0b8dd6cd74b327936187966be25f SHA-256: 83c77037a65860e48801b94f39a61d2ad1e25b522c10236451956541cbe698a0
124 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it is a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs are likely intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3555

Heuristics 5

  • 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 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
  • 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://archinfo.ru/uploads/file/50078187054.pdf In PDF document text
    • http://abnicum.com/files/file/73381769981.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/jimakezetixazidotidibapov.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/xamuxujakipelal.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/nikejolid.pdfIn PDF document text
    • http://abnicum.com/files/file/35931105797.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/622obh9m5g8drtstb3j7b777tv/tuwakelifijikumorukex.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/bukukakefepij.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/jolizimagegu.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/83318588175.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/migiduninafarufubon.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/bobikuwitaxofiregeko.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/bixufex.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/tj357osmno1s4kn2vlbj7o64r7/21460808027.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd99b67276f---fokowebofitekenu.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160860df76ca16---44164856271.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/fifupulaxaletuto.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/9804188990.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51794ee2de---divuzuv.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/memedewawakoxe.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/dla1p3h3v7dk4ls51akds2p1j8/33163873566.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/43addc540dcdef9c8db5a172ae0bf365/60700732059.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d9abcd0b863---38840272690.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb224756fc---41763358639.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160813afd45bb2---zumatokuxosujaj.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/7b45f0faa7d059588f2c147fe3feb310/mizupexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=sine+rule+worksheet+docPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD682 10656 bytes
SHA-256: c9365d8c8b19d307121b77ce4caa79b60dd2afda8e8d96e16b4891471f0ce990