Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c7b1376d157601…

MALICIOUS

PDF

72.4 KB Created: 2021-09-01 05:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0eb7961ce7a2da6dce5c2d07bc15fbc0 SHA-1: b2f808e8ccb00e8faec5dab28d65f56c067f4e89 SHA-256: d6c7b1376d157601f8f82f8cdd81d8f3832e57f94fdfd8a01060415c2c17e00c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via a link farm. The presence of embedded JS suggests it may be used to redirect users or further obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608444f3d405c---rufajaranoxenabaza.pdf In PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/708d78da1fc27d429b3faa602ed787f9/xevilokubapawiluwawanuri.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/sewogipur.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/da572d1b7698a5979ead48862a266163/lovifata.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/69499191625.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/46933763994.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2a8f28df0---wegerodanusubiz.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/60860567508.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/69085798823.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/e5ca5c4b363bd3cc229e39bfab367caf/55167590190.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/84418683413.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/bd88367603805ca7acfc5fbb0e132972/lobusoluxuwaposobe.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/4449263126.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/73514398797.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/vurozetezanigogapaji.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/a84f62b98d2cfd14a81d64a23e08e10d/gaxepevefitewotivapu.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/10378283361.pdfIn PDF document text
    • http://mousike.it/img_ins/files/dixaruk.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/46818474871.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/ead744395d41fd385ec8dc5ee985a566/liluxaturexebobe.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/fineveze.pdfIn PDF document text
    • https://cpc-serbia.org/js//files/34702089680.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/sodusatuvilaguxa.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/46137886293.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/govikiguro.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e4beda59e---dekusaj.pdfIn PDF document text
    • http://hillsdalehorseboIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cracked+lips+in+winterPDF 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_off0000bceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCEB 15296 bytes
SHA-256: a9cee6961548acbda4b583c5a3719763b60710aa312158e1f212a903174848d9
font_01_sfnt_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 10596 bytes
SHA-256: 86387c022752cf2528a3836990ecbb9bafdd6941bbadd16f26aabfb792ecbcc8
font_02_sfnt_off0000fbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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