Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a92187f24ba88df…

MALICIOUS

PDF

76.0 KB Created: 2021-09-02 16:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a780ce0b0a1130f6ace7a4d01cac4478 SHA-1: e442ca3e87fe33a91cf5c3533f42cf244f8b3873 SHA-256: 4a92187f24ba88df559e80cdec5cef37d0905dc34ba032dc6d4776b98ffa278a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The embedded JavaScript stream suggests an attempt to execute malicious code, likely to redirect the user to phishing sites or download further payloads. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=american+english+file+4+pdf PDF link annotation
    • https://kuzeyilac.com/resimler/files/11567421047.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0377d412c3---14614586433.pdfIn PDF document text
    • http://www.bash.cl/media/file/61766906113.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078fb3dc094a---xolodo.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/kixob.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/bdfa07ce9160fd845804e922427f1b8a/65281872347.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/222979804660e17adc5d811915e0ed17/wibosubep.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/33002458036.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a408fea0---dalefid.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/532af116a1335718772e9993f6173328/11927663021.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/xifawipojagej.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/79245382211.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/kewejutukefegiropig.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b50cd98d4a1---melosefejefigufezovagoroz.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/18572028119.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe01eb6c71c---girevitijetakomene.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/pamulasaletogunejodef.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/zuvosaxojubitona.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e43bcfa1719---kaxekukovuw.pdfIn PDF document text
    • http://strechybenesov.cz/content/95739956284.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/9366522867.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/basusatatukelosubena.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/df7bce79e4f1324a864ccac4ec8ff27c/bakutosekodikotifokawiruf.pdfIn PDF document text
    • http://iltorg.ru/upload/file/49072261494.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/begubefo.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/fukunejemujipawo.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_off0000c229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC229 10908 bytes
SHA-256: 422b54d312055abafd98a6e089a225924205c1de45233f53153e88489b6fffbb
font_01_sfnt_off0000daf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF6 18292 bytes
SHA-256: cc2c970ded134fd2bbd0337dbadfe1aec003317bc0c2fe004b066d72001c12dc
font_02_sfnt_off000109d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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