Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5edd42eb613a099…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 16:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9e44df636dc7948b23742e223b7f9449 SHA-1: ca5338d9a9d6c0e9e963f1b705e36042d9d76b4e SHA-256: a5edd42eb613a09989a7d55db7cf67617434496a71ef54feb9c3f83680817fff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=sphero+r2d2+manual PDF link annotation
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1ab6d33cf704d65671b0a1184e8d9c35/biduferijewariromuvewipag.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/42dcf90adbb1e0e1a88e950d750fd033/96425129468.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/pouuoruq229m8s3t4d7elc600v/45727758598.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/donizabi.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d304cf0916---fakupubexijowo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9997a4a06d---59164325681.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d0934a55c43---72181171380.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609198f361ce1---katagamuran.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/tekikin.pdfIn PDF document text
    • http://0930actress.com/files/files/92118381854.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/potajofigunuzaxonesofalen.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/07/20210718163006.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/3768581634.pdfIn PDF document text
    • http://att-na.com/upload/fememokejizo.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/81c0al3m50fqpjqtu5quat16d3/27608654689.pdfIn PDF document text
    • https://btegypt.comfile/69095298473.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/209abaedb8d7858d362c8ff6496d43bc/putokijulabapuwozif.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608534f483b19---dobuvototadojugibeji.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/d9sbisrjob1nkv8ph598dotc35/62006824179.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3479e75f7e---52061168917.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/gh998cjuvk2be67e39m0iilq0t/xofenapemimowapukopejikav.pdfIn PDF document text
    • https://eternalbliss.net/file/zefabofenolezilizajunebu.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/7i48u2tmsgec9rbjoh8v7llmt5/dezosuxoregod.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_off0000de26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE26 17780 bytes
SHA-256: bc2cd157dcecf1918f583e5c5eae7ed1587bc4e24b64b93909bb4e5e1bfe31a0
font_01_sfnt_off00010bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF4 10592 bytes
SHA-256: 3126acbf5e4e0fb997da58926da203e0002513dca7a35dd671a1ddfab7ed6bfc
font_02_sfnt_off000123f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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