Malicious PDF — malware analysis report

Static analysis result for SHA-256 16940be520a8076d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-05 18:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 14301816608554a3d3497ccf85b6e757 SHA-1: e40d25eb3d96d38f9c8be6c962a7c31761d78949 SHA-256: 16940be520a8076d06bce275defa2b8e95a33680f0f09ec7369727e57ee1ccae
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. Numerous heuristics identified the PDF as a link farm, with many URLs pointing to compromised WordPress installations. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

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://philabc.ru/uplcv?utm_term=usha+umang+with+cover+manual+sewing+machine PDF link annotation
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1egg3akn3cjfgs4erg77eqme4s/tuferofixeduluv.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/461e5d5d689688880d55513b925fd6c8/fedokotagudovidudej.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da82e946e9---79665234757.pdfIn PDF document text
    • http://fullx.net/files/sopuzew.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/95163947294.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c720f8ba04e---62503739288.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/10173173378.pdfIn PDF document text
    • https://papiratisk.cz/soubory/66559078480.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809ac1aaac6---13701950553.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/dugavepaxevufanesuwodek.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/90398406790.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070a635e0c49---55042989949.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/terofupasupumasi.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/ac0e6209fb703ab55f0bdf45e2def734/45535489169.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/c1c6076c9330a7e2f065413bd2404aa1/binanagiwapobuxejop.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/nunojizipuwupan.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8ea6bdd67---rinumuxovexawevu.pdfIn PDF document text
    • http://asfalon.com/__files/file/wonumafo.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/lgcse79jqi1385uu1sfslq18a2/90511333185.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/bojes.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/xezeguropejasoxe.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f0543b724---84891395776.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/d5179a94c1924f5f18e634a8cc239761/tolerid.pdfIn PDF document text
    • 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_off0000e42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC46 10936 bytes
SHA-256: a0169b428e2959c6974c48d09f018a9322b0cbeb5b4b2aca6fb0c862e579f35b
font_02_sfnt_off00011582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11582 17756 bytes
SHA-256: a83ff2bb80ba9ead86f453c7b8653401ac4733b1a419870ac88e0b5eadf3306e

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