Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da588b0ec44ba67…

MALICIOUS

PDF

80.2 KB Created: 2021-08-19 18:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 69b56e124a5c81744db5a65e4817fbd0 SHA-1: f33725a1fab2546c4ad6b1b2581cde2f4b4f07cb SHA-256: 4da588b0ec44ba6778f136e781214d268797f3401158bcc564ebf16ef2ee4fd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to various domains, some of which appear to be compromised CMS uploads. The document body is heavily obfuscated and unreadable, suggesting it's designed to obscure its malicious intent rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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
  • 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 https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607117d4a57cb---vuwunonekajaselewufavodam.pdf In PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bd0ad48489---3470743388.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/91437656145.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/dtv9urt7bbb7ok02en5djqqns3/matufazojes.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/48849241099.pdfIn PDF document text
    • http://bdnchem.com/upload/files/wamasiduvapunaxukonezovov.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/kurudeneganukomugobosu.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ef1de9da6---vumidi.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021081414010084.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/robimoxatojatikume.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/nojeniguzenep.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c900d9487e---42645656539.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/dunugafafegodulobosi.pdfIn PDF document text
    • http://sivam.pl/files/file/sizidik.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/77392797914.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/nipigaz.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///91050620279.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/6debf8a862bfe8ebef738c87883fc719/89104843109.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/89bf2d455177135f4f7310bf81fdfbaa/41077110141.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/lorunekuxuviro.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wizutaxobeg.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/nuxuziwirijunagoz.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/18792014223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=kurtulu%C5%9F+sava%C5%9F%C4%B1+cepheler+testi+pdfPDF 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_off0000d3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B9 18368 bytes
SHA-256: 354ff242f38ba90e4ef0d741b067fe48ad19c6cf03face0f78cb8f19c42d7d63
font_01_sfnt_off0000fff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11808 10936 bytes
SHA-256: 4785c5246ca17cc866a5e5f901e8f4b9565cd5a3f4e203cc6d7c77f177e4fe75

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