Malicious PDF — malware analysis report

Static analysis result for SHA-256 589ae008701872c8…

MALICIOUS

PDF

89.0 KB Created: 2021-08-09 11:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ff9ec4a9c9df2b4330bf6b148040e2c8 SHA-1: ea6f6a1ec58769e9c2821d20686d48b82f718690 SHA-256: 589ae008701872c89deb97f0d408f2e0e3e7666084100823fcfad497c3b36c80
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://asesorgubernamental.com/images/file/80598306255.pdf In PDF document text
    • http://cdmatik.com/uploads/file/90143009987.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc5b656d3a---56561016837.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/520075801.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/44o09tv923uersga7uj11vpc46/luvemuvexoxet.pdfIn PDF document text
    • https://laser123.com/geektic/files/magufurezubefos.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/zomenerikobuf.pdfIn PDF document text
    • http://ezibra.pl/upload//file/gikafivisunanijoviku.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/54072246780.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/fp4gl6sinqbhplhhadqfkvqgok/71531630598.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/d5i5s8ojrbf1lsvtk6lc38a2q6/fagaluganuvidakosiwotutov.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f991bd2d128---suviv.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f2aa2ccd5---62914079298.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/lmpiaukaiafgeno6m2ks7klq2j/kamado.pdfIn PDF document text
    • https://hirurgija.me//files/wafuguju.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/xumedenodalu.pdfIn PDF document text
    • http://billsky.ee/files/file/xolitisuvijifo.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/6d69f58375b559795c82eba9f5dcd926/sumujelotuwarilafunilut.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/ropirukolupogafiw.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e11ac761c---fipavozul.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/13480669505.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/22341127328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=livro+o+poder+da+a%C3%A7%C3%A3o+pdf+download+gr%C3%A1tisPDF 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_off0000edac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAC 20788 bytes
SHA-256: bf1413d19192236001ed24ec28502466b2277cb9029123842827484ec9113cd1
font_01_sfnt_off000120af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AF 11424 bytes
SHA-256: a6ad7da55779a8469b1bd8ae9e15308110e8364bfe38d08309094f558f629137
font_02_sfnt_off00013ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1