Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c33873f955b1854…

MALICIOUS

PDF

88.4 KB Created: 2021-06-26 16:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 762978e28f5a8b8544f9909e7ad028ea SHA-1: 54ca79682a557b9cfdc955d388d2d46c679b14ff SHA-256: 5c33873f955b1854f21eeafd6988ae18bc2eb7e5c55af4c887d8611d71306774
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//zuzafelatizimukepotere.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1un66ss93rvccej7dbldflggl3/kegazexuxe.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8503b054e---25378000741.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/mewurenomimepivog.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/51c440e834424e1a74a7f62aaa3f2fe2/587792801.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/905588677.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a434663c91---wedunifobutu.pdfIn PDF document text
    • http://humanlitech.com/files/files/fuduwuz.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/5529dcad7b6c89e883683084dd40ab91/58661407283.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085f87b85a06---21351665082.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/96270422799.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f02639cf55---xigadoterazozune.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/fb3d86f5f83cc48747433a15b59bdc6f/towavebifus.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a20d4e89---59776136475.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/wipigalexudemovelekex.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/cbeef151b14d6a616cf826f3ecc4b7a5/85973521718.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160727421a4353---7768116304.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/56aab6434cc890c8455082998411d0f8/62883833695.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942b7a8e7ef---72897200277.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608715a76ad91---94526279126.pdfIn PDF document text
    • http://bjjiffy.com/upload/29397908100.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/5d6fd4b13616903df7c153d8a7657ead/8389222581.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160763c294a02a---fupojulenokixa.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160867597bb228---55165127431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=day+dreamer+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAC 16420 bytes
SHA-256: 6ce208cbcedcedf7803a1f7fb5128cdb5d7fab8470e792f45c79156b81431bee
font_01_sfnt_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96E 22196 bytes
SHA-256: 6d34be13422806e7dc9851ecc2abdc750b41389064708f3f50d2a9d4040ab64f
font_03_sfnt_off00013012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13012 10592 bytes
SHA-256: 872f2ae1810344831dd79dbe669594f4fc6cfa0de5217201a7e8cb78467af70b
font_04_sfnt_off000147bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BC 2336 bytes
SHA-256: fc4d62a66e06d4e39774e30cc79049ddf83a5a6df43fa3a297ce7e462946bf84

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