Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1530650ca263a51…

MALICIOUS

PDF

89.6 KB Created: 2021-09-02 04:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 164ee38a29642fa8a9a140f1981d69b7 SHA-1: b79511e3eef5e3d7a24368bc796bd250dc0bacee SHA-256: a1530650ca263a5156027894788b4811453d4b19bdd2c94167af101300fdf11f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and a phishing attempt, with a high ML score and ClamAV detection confirming its malicious nature. The embedded URLs point to compromised CMS upload storage, suggesting an attempt to lure users to malicious content. The file's structure and heuristic firings indicate it's designed to exploit users through deceptive links, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/ed2220b32e4f11ccd2df51534af41a1f/zexowajoxekivijeful.pdf In PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab15323bb91---gaxozolonuboduxuvojov.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/rovopoxikoxur.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/jifemugiwefukemujabijalo.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160da653f07576---suwakeretiragozogamomik.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/fekimulexatofa.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/20858933205.pdfIn PDF document text
    • http://irollee.com/userfiles/file/bubomatuzazinaguneg.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160794998a1158---xavusoberulalis.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/lugogalemebaxepuw.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/81623940191.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb53e799fec---fulobapajetefinuzoz.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/nubafifavax.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/54614726204.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210807064734.pdfIn PDF document text
    • http://sns.hu/_user/file/sozetigomunekaraz.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/55104661827.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce805131b2---40941984203.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/tapenurokoxoxosonuvoxa.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/6c7be5f2839be41607c8374d8b7c0684/43892153776.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/figolipowakozetowazo.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/14154112067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=a+large+deep+rimmed+gongPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 17932 bytes
SHA-256: 41de8ca332f90630c8d07022215ac28fd98fda67ffebceae11e5aaa683b26e79
font_01_sfnt_off00012918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001412f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412F 10452 bytes
SHA-256: cb43cb0935cd2da6910d0e6de56f350e10e5678d306f09cc4b47673242c49ec1

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