Malicious PDF — malware analysis report

Static analysis result for SHA-256 774702d3ba5d654b…

MALICIOUS

PDF

88.2 KB Created: 2021-08-31 05:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6d1a3eab87c1a4778a70f27bf3070784 SHA-1: e71af4504878167ec44c47afe1b712b34826cbee SHA-256: 774702d3ba5d654bd5ff4bcfd40828a74a688ca7d7beb980008d25607ab62de4
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress upload storage and other potentially malicious sites. The presence of multiple PDF link farm heuristics strongly suggests the document's purpose is to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab903cc3005---fofeliloginetif.pdf In PDF document text
    • http://fairmonteast1978.com/clients/71195/File/xubelap.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115b27389950---motezedosefulijetijoxi.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/37984439030.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/58848327346.pdfIn PDF document text
    • https://armenia4d.com/contents/files/xinezepojesawi.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/cbfm907ojtm9na018jp3u51oe9/72875975592.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/63057236194.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/bexidutuxufesadupuxejosi.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/kerifejolafimovexag.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/94844004556.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/toderiwumuxigipelet.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/81375471913.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/6thcakbstslkb312v6grpd17ou/luramikibinogolufov.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e619c53a9b---konuvorogoja.pdfIn PDF document text
    • https://hoalavender.net/upload/files/saponepofo.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4f8e93301---42593316225.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cb7a256dc---66024183340.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/28129100034.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/81e4f0c08f92a69a83efce93c9a17866/fujum.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/nijodajenezubox.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/nixudilivinikaxid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=tenancy+at+sufferance+floridaPDF 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_off0000f37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 10644 bytes
SHA-256: 0297034f6227bc87fc86e2b42befdd84cee65914006042e80e300b07af472408
font_01_sfnt_off00010c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12419 17752 bytes
SHA-256: e1914371f5358a820179040c1ddb03a03d28ec17db18c77d7500433902c37ef3

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