Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ca46351a47c476…

MALICIOUS

PDF

83.8 KB Created: 2021-07-13 23:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f04b20f415fd4b2abe9d62db1fd05df4 SHA-1: 783fafa42fd228e7fc5c2775a1398cd1345cd5ae SHA-256: 05ca46351a47c476c2f8d82d24c90294117f2e7b0ffd85182614ba179129ec98
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a30459ba45---wasalonuranofevo.pdf In PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/c7f423d952bbd28011c79e9480b7cc69/17587392685.pdfIn PDF document text
    • https://educhina.mn/editor/files/tepizopobofe.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/22498516221.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/49185233091.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/44116314611.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/48615380712.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/94857540952.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/galigi.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/liwujetakufutew.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/japenexuxepiwotug.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/kupctnp9l400saobs6oqjnd8ni/wofoxozes.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/jibazetomajimo.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e29bbe997d9---76128349183.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a988578dd0ca08c8a84c4091f798564a/tobajusapafanujasedunod.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/4appibntlqni7ncjrcc7q8d8j3/51193105640.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16077141586300---jelobakezijuma.pdfIn PDF document text
    • http://parfumkin.ru/files/files/tedewuxuwalabinow.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeed0e7b97---40242173482.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/2f233216623b3332444f65b93e3a62e4/26643951197.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/1213060074.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/32701456881.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f5f5a9fcebfe0525a113c9a390e23813/bofoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=food+with+msg+in+itPDF 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_off0000e870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE870 10316 bytes
SHA-256: c99486fe898c3badf2c8f55c8ec3edd0732463ae6b1999397e2bb3d729af9594
font_01_sfnt_off0000ff4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4B 16560 bytes
SHA-256: 4162950c23b5922278390b47739bde253d178d2137dfddc17d29614316223cab
font_02_sfnt_off000129f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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