Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9c58faacd26dc1…

MALICIOUS

PDF

105.8 KB Created: 2021-09-07 13:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7048d6b00e4de2b9c5afc5cefbc79fdf SHA-1: f30cb77af8260a21c3c0b2193fb5a92c6f33b0b3 SHA-256: 1a9c58faacd26dc1bddb4974693d4f579ca8844309aa31b964d358fb16ae23d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://dioceseofniranam.org/userfiles/file/tikopavu.pdf In PDF document text
    • http://ser-buk.com/userfiles/file/31705202293.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6f907bbcd---38002359069.pdfIn PDF document text
    • https://altbuket.ru/files/2942948964.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946583e894c---42962514846.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/xuwipigigawaboteniwir.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/moxemelamos.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/xikoruwululela.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/luvenobekisusewanimimegig.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/romoxofugifugajolera.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/78070568540.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/64187019039.pdfIn PDF document text
    • http://le383.com/uploads/files/51869490871.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/jitezijividujitonaveju.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e62cab15dcd53c5094cc7fdef9a4333f/11800239854.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7522659949---faligoxexaxedanisav.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/11195142564.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160975e32a3e44---muzutonuwamevinegu.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/8516666406.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/43824575814.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/6147859980.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/judomedakepaxit.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/30b476605d459f2cf9de7d26d84de4f2/91216248555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mixed+tenses+exercises+2o+bachillerato+pdfPDF 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_off00012fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE8 11072 bytes
SHA-256: 87a29d720fe3f11a5c0473e892fbc5bab744900abf8099585489ccca87e57371
font_01_sfnt_off00014979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14979 21088 bytes
SHA-256: c98786b56f6598c8411863525c3bc11bcc71adeb95990c2b5928978615faa13b
font_02_sfnt_off00018106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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