Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ae11b28d3a5537…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 00:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6f7bfd6dead8422494626c43fa3f7b0e SHA-1: 425e16c7c2314d42c8316b989a650fcb920955e1 SHA-256: 86ae11b28d3a55371a933dcfb0f4f6ae8404e99480408fa75861c52888c80d96
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent. The primary attack vector appears to be a spearphishing attachment leading to a download of additional malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3903

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 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2beecfe87---13580268939.pdf In PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/1855101a9913e441ac9f81708dce4624/26166766417.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/jufuxu.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/jizorigot.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/nuxisadoragakiji.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf36c4a43e---sovitunemawevet.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/82974840745.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/29028941265.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/74196194130.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210912050337426.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/pomawe.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/93173813324.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/20164710679.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/kaxazinopitifejaribi.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/gifefisuritoretej.pdfIn PDF document text
    • http://fruitsad.pl/images/file/97060318556.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/fizulatigaredejos.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/79412644850.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/bopuluvurumolalewijuwez.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad0def6d8---33267370478.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/87145051705.pdfIn PDF document text
    • https://funbugs.ie/files/file/12913831063.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/vigidexisedinovorenubetu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613376713a24b---melogixifigepezitoxij.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec6ff58b39---betopedakuxumedaxafoxi.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/nizivonufapizakel.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/945561110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mi+control+center+notifications+and+quick+actions+pro+apkPDF link annotation
    • 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_off0000e512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE512 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD29 10944 bytes
SHA-256: d875fafb62c696655e1f331cffb8631cec655acc8343bf5c208cb224b4dbee8a
font_02_sfnt_off00011673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11673 19372 bytes
SHA-256: 261d062c4b34c8ea2fb5ee3ad545c10194a651a8f0c40428824e7239b71a31a7

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