Malicious PDF — malware analysis report

Static analysis result for SHA-256 785cf8b084c1ac32…

MALICIOUS

PDF

93.9 KB Created: 2021-07-25 08:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 24670917d9c3d66118cfdb3dd007e752 SHA-1: 0d4b64e7d80566260835b1d3854aad9336079364 SHA-256: 785cf8b084c1ac322f6ad4d4e82bffcdc8b6d7a2dcc201ff7c42783ff1a46b47
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised websites. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/4cac6e91f69df25c9f39f709eaeef5b4/revesezulevekulasoxowep.pdf In PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/82165695959.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/torisesefurogiza.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2c8e120c9---10385371377.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b5962c8fd---salupamaxiwulexenoxaxumu.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///rovijipilowilaxuzoxuwigew.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d200350f65---24882898086.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/mogixefezapekod.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/4d671d019197cf4170e0f137face095b/90971955465.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/87a67b6d8ada0bde0698c0ed19fceb9e/24519076099.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/linekimuja.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210714_091654.pdfIn PDF document text
    • http://expresskaliski.info/file/faxes.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/72726433500.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/gu3ugif2hiu2vmo18idc3ua005/74937237215.pdfIn PDF document text
    • https://birotex.rs/images/files/5877054192.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/1du24gv17tri3da3maijatjs20/57101865452.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/21622267766.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/28923308652.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc22e81c91---86706374296.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/42823524231.pdfIn PDF document text
    • http://goldmustang.com/files/files/70217065318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=shayne+ward+breathless+mp3+free+download+320kbpsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED41 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off000102b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B8 11592 bytes
SHA-256: 6b931206899647c3b08db52836c7e718720ebd0fe5aea93fb3c253019f722fde
font_02_sfnt_off00011df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13607 19100 bytes
SHA-256: cdd13e29c02587fbc0d5bb7a2a33a459277df34a763b976a6a2439b6fa36f4a6

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