Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b885f1810c628fc…

MALICIOUS

PDF

84.5 KB Created: 2021-09-05 19:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1b3a6fb790b1f23c80a6f88902b55ccd SHA-1: 3cf6f2f91d2d10ff8a67c604d24404e7cf464d62 SHA-256: 3b885f1810c628fc37bde6c5a84f8451a6ddff9955c5868eaea368a1d1fada72
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristics indicate that the PDF acts as a link farm, directing users to multiple compromised websites, including those hosted on WordPress upload storage. The presence of ML and ClamAV detections further supports its malicious nature, likely intended for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8668

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://huntic.ru/uplcv?utm_term=gospel+of+john+summary+pdf PDF link annotation
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a9d45b12b---48498921667.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/kewunuzuzafimupabalu.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/11b51f85833db02fa0c50b2f2ccb5aa6.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/95918039001.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1611781be4f958---87335441275.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/judewowire.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848d681427f---49002671448.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/3ea5c6821f7ca0cbf6c7aea25d9eb4b9/palinikedalofexa.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/96459594239.pdfIn PDF document text
    • http://93564497.com/userfiles/zikowewe.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/84607679555.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/24946803897.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/28869948041.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c23a9181c94---6565097258.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/fevuguxu.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/4962129f98e7db4011ad4aa4eff0b1c4/20353897233.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/45738969784.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/kibejo.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab85fcda24---zuzetok.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6b9f15c37---66365088341.pdfIn PDF document text
    • http://geodez.com/pliki/file/viduwubidon.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c9b2239e7---19251206353.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/jumizijedixizusedikaxi.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/lubenarudemejotujumewed.pdfIn 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_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10902 17704 bytes
SHA-256: 67fe4c478370124778b3d710a1f498080b9b31dae677ebebd790855c742ba343
font_02_sfnt_off0001368d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368D 10956 bytes
SHA-256: 4433cec6826674f37e9b5c270a12972865d3d4148896d3473c09c54879a246b8

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