Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1d9b50034d8f6c…

MALICIOUS

PDF

90.9 KB Created: 2021-08-14 09:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c8946768b19ae2ab4364126152e7161b SHA-1: 94c97f90a212803e7c8b4d4e004ae3e1e92abf10 SHA-256: ad1d9b50034d8f6c2dcc8528d39c5d0f0cb1a079da137a4b0342780d4ca3eebd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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=fiat+punto+2004+service+manual+pdf PDF link annotation
    • http://synphabase.ch/upload/file/20709300492.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/18298827433.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/kinabofowa.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/7953078052.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/b108552fdc052cc7d0c979f99c1e257e/14046814033.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcad9e9c80---kutuxosam.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/lewetogetoneluxajenotix.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609322fd60a3e---97910096686.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1610d6a989e730---kevafipegajaburedok.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f5c308a2ca3---10047637044.pdfIn PDF document text
    • https://areicon.com/images/file/xedofajekamut.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087cfac5fea0---77294099512.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607016acf15f5---tiripedunadijemagavi.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/66507253075.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609061b28bb5c---rasemukojadegexewutapuwur.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161120947dcab2---modewisatirame.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/q99hiqfm477ojtr83viq7pvre2/kawififobatip.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/e74dce3179ea2329d7429a069c8294f9/37050738345.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e4c254b30---27863639245.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/gubelagowa.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160835090c9587---30319249743.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/52888740969.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0778688839---29819806152.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_off0000fe6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6A 17184 bytes
SHA-256: 782f9236fc1133a29d477eb4973fa429414f9712a37e358bc309e42bd3c5928c
font_01_sfnt_off00012ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143BC 11244 bytes
SHA-256: a5ae8cea4d71a3783c9fa0c8d9315a5909108a689f985b28a1dba01a127e9bb6

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