Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb84c17883def2f3…

MALICIOUS

PDF

69.3 KB Created: 2021-09-03 08:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0d76de92669a67c090fbc4d89c1c5fca SHA-1: 8e50d14b492d8914b44d03e9ac6180e260dfcb65 SHA-256: fb84c17883def2f3dbd5458c71ce88046a0be48da5190b8b4e2fbca06e349ae8
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories. These links likely lead to further malicious content or phishing pages, aiming to deceive users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7757

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://amdind.com/userfiles/file/radigujapumunaxasosox.pdf In PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/5c309ba784864d09587f4eb123120031/89115016566.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cece656ac---jiburokaxemidop.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7aead352ad---vumoparofozopa.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/fomugelodiwo.pdfIn PDF document text
    • http://seritour.com/rsm/files/diderafigevefu.pdfIn PDF document text
    • http://asustainable.com/global/file/bifaxodujobewali.pdfIn PDF document text
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/68469441134.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/33968222943.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/47412614326.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/siromo.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/sinijojiweja.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/89961859121.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/8730306094.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b03a35542fd---125834607.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/37695679063.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/19913299873.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/5a20e71e96cfecee676c0f16309c5fcd/jikobujapewajobanovimi.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/nuvuwenuk.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2fd3614d1---97812471987.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085d45665136---vulivusitu.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/99785041595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=pelonis+digital+fan+forced+heater+manualPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD618 18252 bytes
SHA-256: 8baea006a0e29b26c1948372112ad4d546301ffdf09a63d5b046376e4f1f6599

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