Malicious PDF — malware analysis report

Static analysis result for SHA-256 30a87da85d6931da…

MALICIOUS

PDF

85.6 KB Created: 2021-06-26 12:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 13d7453905f7d2a722003219eaca0a70 SHA-1: bafda33711723ebb5db7d2ad942ca7a0c8fbf5dd SHA-256: 30a87da85d6931dab7f790ebc9eee5a74b453222e16d561b5d64dec2c69970f0
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external websites, many of which appear to be hosted on compromised WordPress installations. The primary purpose seems to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://oniceh.ru/uplcv?utm_term=rhyme+of+the+mariner PDF link annotation
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/db5448a1ab932e16888ed6a21ac93389/kufisutixobudenuzitoto.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/cc1d277f9016f106912b532d6c43a8bd/dezekotog.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/nafotatanujojoxivolipot.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609744f9a3260---wupak.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed964835b2---76729633337.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fab7ad70c---26210806383.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39ecf8fd06---zebuva.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160810668d4b9a---48023577534.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/8bccc594c99b2790e1210521d23173d0/wimusepuzufiza.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a74df1e6d03---82453448024.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8d7789af4---fopumamexas.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/dozufowiporezu.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/zifabufato.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02bd0e4cd---wubiketivi.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160890bcef2427---95756529380.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c9293f80efb---65586093058.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744e3ab2bb9---66872308015.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc01eeb25fc---ponujaroseguzexufafe.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e34104e0b303cb7af96749815065ed66/buresitisezog.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/46926932225.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a50f75a5beb---koripujigimofokadomolibo.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/66286a32798c6e37070adf392a1e2b48/mokebedisa.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/xumipasa.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_off0000eda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 10424 bytes
SHA-256: a772759a269f92246c56764b586701905478383a48793bb9449eabcec52d0e21
font_01_sfnt_off0001051d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2F 17072 bytes
SHA-256: abc8a34ccaf48b662dd9c37eed5dac8929f9765d9387541b7921e547bf467cb1

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