Malicious PDF — malware analysis report

Static analysis result for SHA-256 85787afd1410179a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 05:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8cd1893ec8d602682ff5cf781e746d7f SHA-1: d87cfa8e3e0e6b31e974f3d9e38f568fa4b5f05a SHA-256: 85787afd1410179a7e9667470a7322a16b95337eb37b60a227b380ec48aab005
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://prokoncept.hu/admin/blogfck/image/file/51301734059.pdf In PDF document text
    • http://arch-teh.com/pic/userfile/zugem.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/68927245979.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e039f721160---62340681320.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a94803778f4---91663433264.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/15984386710.pdfIn PDF document text
    • http://jfe.hk/userfiles/37870617542.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/minodopopewinulonifexalo.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/24375147759.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/ce060a63eaf2c1f697c81221164526f0/45711158035.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/vigijafogaratodowopajajem.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609001dda8ee1---basozebijowoxavo.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/dubotisetasamodiw.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7869b1b3e0---dixobadukofogiwigoloval.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/daxipizunor.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/84675601916.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3554d9e4ae---68810438620.pdfIn PDF document text
    • http://mavibusiness.it/file/55183724359.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160df15e69b553---bowelekaperaguno.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/guxavemimifikedu.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/34550349981.pdfIn PDF document text
    • http://guowangcable.com/d/files/54534888313.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/82de1f929a1c9b97602186b0c42d8032/misapiwumanujuwomimak.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161246d84ed30a---jabugaxodafavapikujotik.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071c0042cde4---pitozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=bissell+cleanview+ii+bagless+plus+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD562 10844 bytes
SHA-256: abb45f82fffbbe6ade51356c4533c0c45fc742dc15ebc60cd1e38edad8193ee0
font_01_sfnt_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10654 17840 bytes
SHA-256: e25d600e087b82c70aa69b4f1c75e2cfb24401eb842b5ae49d1aad12d13aab73

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