Malicious PDF — malware analysis report

Static analysis result for SHA-256 265b9a10d4bc4196…

MALICIOUS

PDF

88.2 KB Created: 2021-07-02 19:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b73095db57ea631e4d6f93f0e0618cd SHA-1: 1365762edcb41700436e4bd8620e5d69d9ed42c0 SHA-256: 265b9a10d4bc4196cd8df4894548b2e1541d39e4d557dc7cd83633b6830945f7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://superpart.com/files/birowalimaniw.pdf
    • http://king-ber.com/UploadFiles/file/20210622165907605.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076f6e4e149e---ribegi.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9f4664afa---lawizimegadorosebimokowe.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/d2o6nfjaorlg18f7cmmssl32hh/lodumevofutasefemaz.pdf
    • http://salinasouth.com/clients/11073/File/gutokapatun.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160797325dbfd7---6827469788.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/33946b18bc72fd1545cc4f407ca732ac/81933147832.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/07b0dbd6f36a2c60ef4e9aeff7bc1ccd/1222564604.pdf
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/wuwaruwo.pdf
    • http://jullien38.com/ressource/site-image/files/85448568111.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/f19anh0k9ukf0ujo8nkaj54ih7/67378935150.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc13f8dede---sefuvasefixotam.pdf
    • http://namthangbasaltstone.com/uploads/image/files/93528860072.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/92ac4f4f4be5f463430f6133741ee6d6/mokajajapi.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608952c4e45ca---jikefomawi.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc9aa2cb38b---kezaso.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/6r6gd8llquarmhe9hvhivse1tl/rojivatijopevinaxenuguzir.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6ca5befb6---65315652910.pdf
    • http://accessprecision.com/userfiles/file/putabalivebebesewamapiroj.pdf
    • http://hndgyl.com/v15/Upload/file/20216151620479886.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c93ff9933bf---jafuxosibafenadija.pdf
    • http://asustainable.com/global/file/54598316018.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16093677516e4d---botila.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=imm+5409+guide
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A7 16792 bytes
font_01_sfnt_off00010eb9.bin
35f941ff04e1ce4f138819a0397428f2eb67ffb5bbc24f232f2c98bdd735acdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB9 17740 bytes
font_02_sfnt_off00013c7a.bin
580596e0eafeca1994271363c3c30d7e444386215b712f25c42e1988650e19f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7A 10344 bytes

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