Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a923a7cfd59743…

MALICIOUS

PDF

71.8 KB Created: 2021-09-03 21:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c0d92774478fa50c4ceff7cc11400b75 SHA-1: 899a41b038a4705356c64a160258cc2584ada794 SHA-256: 38a923a7cfd59743c7587c296255f819b8120a8f19b8480162c66f7c2d0ae29e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The embedded JavaScript likely facilitates the redirection to these external sites, which are used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=input+type%3D+file+accept%3D+application%2Fpdf PDF link annotation
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/tavisakef.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d986e40db1---tijuso.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/8406021808.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210619065620732.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/93283622050.pdfIn PDF document text
    • http://hidramaco.com/files/files/gagasamuvipesug.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c477e87a6---44558870721.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/64256314687.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/zozadixajakefowusobovasi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/sft8770a6uli6no4gnmnljeif7/83915783211.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/wepizofokaxeno.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/73087bbac84889135fe9ecfda9a93837/forofakuvevebari.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/30853207317.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/97326079553.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/92977787480.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/78027545944.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/dolezakasikisavidej.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/1ea346481e6d691238cceed7fa4f2689/disadimoteb.pdfIn PDF document text
    • http://npas.ru/pic/file/vedadaxesidekitowa.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/darobudumorekowularen.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/a3c09b5a31c13585660ba339722fffdb/zelisegefakis.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/fameno.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_off0000b073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB073 10592 bytes
SHA-256: da9631fb9972f6c71eeb56d18b0c240969d32e098985ed702b2ea7dd6cc95ff7
font_01_sfnt_off0000c8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DA 18760 bytes
SHA-256: 2f1e9142fc1db1beb07b2ddb470c774533c859ca235fb16b268842697a0b3b33
font_02_sfnt_off0000f7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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