Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3a9f558b936361…

MALICIOUS

PDF

116.4 KB Created: 2021-07-03 07:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 959a18b246b98a6b6e10209c46cad17e SHA-1: a52ca18bf6f30cf6d73dcc5e468cfb00564f4ea1 SHA-256: 2d3a9f558b936361c76061d8515eb2b85fa10d93f4a911c93eb64212a35b1584
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links and the nature of the hosting indicate a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://chcial.ru/uplcv?utm_term=chromosome+number+of+mitosis+and+meiosis PDF link annotation
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/c341fb100b0c0835e8add5158827ebf6/9086535818.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e14c5273b8---nexotevolegegomesizikume.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/bupesabupabija.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/nukesexokonefavu.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/litanufiz.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160808fc1570cc---fegonuwabuxitoti.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4a60f1e2b---40139884613.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/jitevorivupide.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/08573a9d140adb6f78295818453ef571/boperojejasuduzobe.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/1d5d506p1sj91rclfkg5c1m05g/98371765066.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/fekevaverunifugim.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/pilulovatolexenazawo.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/renunujivepiwojazo.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/a4051d7a60217875ed2b7d8b223e533a/40032597610.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/kujowusafalukifusosu.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210624090319565.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/xesevarerurebujobe.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/moxawemepibikawugirin.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/bujunetupozonuf.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/73515936936.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///71808031174.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/lunegepidalijazinitav.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/67284b58dc8ada59f2a1ca3fbcdc64c9/81093472572.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16001 10844 bytes
SHA-256: 2a0671bd8500380ea76025f5ef14c462bc42b68acba69c8d04d1fa92adec8dd6
font_01_sfnt_off000178e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000190f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190F3 19416 bytes
SHA-256: 5cdd0890a5ab81f443442427d88673f3d59ac1f1ffcfeb2331392f62dae824c8

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