Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9adcb5e63b2b165…

MALICIOUS

PDF

75.3 KB Created: 2021-09-03 06:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae10d89121f10e5328c0005c5c8063ca SHA-1: 9aabf93e99d8d4d4c3116c1d7d5d5d51bc9d67c1 SHA-256: a9adcb5e63b2b1654cae6e53408f8700b41c3b63bf6e66a60e3a7a370ae1f98d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oniceh.ru/uplcv?utm_term=tp+link+wifi+repeater+manual PDF link annotation
    • http://zoncmswebsitebeheer.nl/files/editor/file/11397101127.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160811bc7378b0---notubikikapod.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/ruvofarunoto.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/61805953243.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a71b88f77---5916803410.pdfIn PDF document text
    • https://stvorki.ru/files/file/rifufuxanapifi.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/1599996611.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/13838675624.pdfIn PDF document text
    • https://turismoporsantander.com/aym_image/files/40008551429.pdfIn PDF document text
    • https://cochleartudaskozpont.hufiles/76943183046.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/baved.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/sapogevegix.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ddc762273---buvopele.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161157b46eefdc---97377824450.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/41906365220.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608158962b64c---xivobarafatutalerud.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109020138267572.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/914f56a760a90465acd40409bb7247af/nonazadolo.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee6fb34ec9---dixevunolawoza.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/ponokegebajaropimipisul.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/7t2iort345k624590d7aspeorl/bepumotine.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d16960d8ab---dijafaminedux.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/bojobagikuvexopemegufel.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_off0000c3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D1 10472 bytes
SHA-256: 073bc8f8d946af1941a04f159412d69c3d397ef75ce84f6e6feffadf8f04bc8f
font_01_sfnt_off0000db9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9C 17024 bytes
SHA-256: d6b04456188e4fabad4754de8b9713041a2d3275538aeffcaf5bd4ea594b2441
font_02_sfnt_off0001073d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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