Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad264ae47ae7fd1…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 13:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ff6218196d091dc8a41ada938cd943e4 SHA-1: 7f9c01602caf998506fa3094fdc14b96f9c265b2 SHA-256: dad264ae47ae7fd1526236ccaf852a931c3aa21d87e834fff86e017522a396b4
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://nfc.soo.jp/file/91340481288.pdf In PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/fadomikabovakigep.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/31741784347.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ca89ac6a5a---kivonepabobosazinom.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/sapemofijuk.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c6940c20b7---10811673156.pdfIn PDF document text
    • http://getem.eu/files/file/98456161570.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/13896786112.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/luwoziwanakeresofiwulanuv.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/xesumevanivanibov.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/75391947010.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xiranobopamisolubofubavi.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca15a7c3de---38980763279.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160906b75e1d26---72803376766.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/97905004379.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160739f80ca633---32351690167.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/6f84c9081c848c837e6626b51542382d/47146871296.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/66138148484.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/todopena.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/2012dc86ad6b3a175d1d19161009f3ac/jijiti.pdfIn PDF document text
    • https://blv.by/upload/editor/files/78106594105.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/wozixonawovikukutowe.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa1db4355f---4956033218.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/tavefazokodafog.pdfIn PDF document text
    • https://palet-school.com/files/files/kemokabopumupuvezes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mophie+3+in+1+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8B 10468 bytes
SHA-256: 09cedef01773c5609f2024eb06f70d9f68c0cf3a0b39486cf5af9bb418fab12c
font_01_sfnt_off0000d51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2E 16684 bytes
SHA-256: 728a7586f46006ed5c00c788358f82aac5d70cb74cba3aecd9637b41b85f23bc
font_03_sfnt_off000104e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 17544 bytes
SHA-256: d89dcf100f490c66a7f4cbd7d04eacb25fa4aa574b332283ff1b52c43ccdab32

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