Malicious PDF — malware analysis report

Static analysis result for SHA-256 5006a88ffae78a72…

MALICIOUS

PDF

108.8 KB Created: 2021-07-31 01:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06fb53bb331f0d342bb0cadd00ce0462 SHA-1: 8b0f5c315b7a7742053fdec9f32dde6ba6e1b443 SHA-256: 5006a88ffae78a728e439a5eba7b21390772cd2b5a344ea8f85dfe6184f339db
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9634

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://secolink.sk/userfiles/file/67113365355.pdf In PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/53345adfe455ab5645ff8ffc37cac8fd/zujugodemefovozerak.pdfIn PDF document text
    • https://murten-hotels.ch/userfiles/files/3914577376.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210707001059256.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806e7c14558---lekeg.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca62c3dde2---63846095422.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/tpobh862tva05v00s581t1mnq2/69114052478.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/qnfn2eaedmf2umfkhhf1v26bn0/setove.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/lofegugejupix.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/nunalibukofoxogofevasanuz.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/78984519073.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/1jr2el0n22ol3rqh35ks6eqhu3/76077264919.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb76e97ff0---rufubolofipilobakukez.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/64510024173.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733d4c7d15f---derevijugumaxugazo.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160858cf3da693---53844708631.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad7e8b8f1e---kaxojojafisag.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/70752553173.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/35081146663.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/logowixodororemunedo.pdfIn PDF document text
    • http://spiregene.com/image/files/20210721_185010.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea0e1e44a4---97396038912.pdfIn PDF document text
    • https://cncunse.com/d/files/fenojofejojojubavilav.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/q4unlt976il9muvbhuqk8qovo8/zolujowowagexomozomeb.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/50252809783.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/nesaxanagazosifarejotu.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/7b6ed8b78979f10520b3ecd21ac18538/dopijoxunixur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=como+descargar+super+smash+bros+brawl+para+pc+dolphinPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000130c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C4 19924 bytes
SHA-256: 0250dc8e02da2e41cf290fd98697624831fb08efe24d711802b3d61e43f6f145
font_02_sfnt_off00016474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16474 3208 bytes
SHA-256: 9a0daf7c98be59bd45d1cdc53e7a7b82731a41a7def25ee91c5857c4a9430731
font_03_sfnt_off0001714e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1714E 11220 bytes
SHA-256: 277f19dc455df979da2d683e3505f691817c2f53982dfa237473e870ebf3f77e
font_04_sfnt_off00018af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AF8 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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