Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c85199109607db6…

MALICIOUS

PDF

94.1 KB Created: 2021-09-07 00:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8b0dc044b7c9f28d6f4067b3553bc8b6 SHA-1: 6bc2491673460572eecf1b020fc89161c7e2c25f SHA-256: 8c85199109607db6c600221646e39135e62c85f7fef14fdd69b286e88893e634
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 http://eia-edu.com/userfiles/file/1589759864.pdf In PDF document text
    • https://tomas-music.com/contents//files/kazij.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f52a6c2e83---90939534645.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/pigodafujux.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/72b7d3f53dae3ecac0289ced5f3fb713/30118220888.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/69eqdagsljs71q7c4t43jp9bu4/54593151213.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/mubareragedutudid.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607407ff17d9f---50551765139.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ee26a2f22f02645451a6f376899d98b7/nobenuzurupolijiki.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a21788e2ea5---nileviwi.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/fd1813da56a9b25a0f05272d492bfa47/lavixepo.pdfIn PDF document text
    • http://monkeytailranchdonation.org/clients/e/e8/e82116dd0b5861b0917add2a69208af2/File/kenafabebawesepara.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/25927363219.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/5e5340059580dd10a3d2013f082a7685/71565004436.pdfIn PDF document text
    • http://ahchala.com/img/file/92931561321.pdfIn PDF document text
    • http://01host.ru/userfiles/files/xelexadeluvekomawimovase.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-8-28/20210828193645509131.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608379c8931ef---lilizobafisofuwiruwo.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/20549953040.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612c12b367893---wibujojafofegedoga.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/giwilonalosarulabive.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/4360e44beeb57e77ea46abbfe87beeb1/bamubavewipalexodulusofa.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161180c8859870---zoradumitakakab.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/4bmtv5g49u6es2ovfmoaarrmgr/32068819212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=apdcl+recruitment+2018+assam+pdfPDF 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_off0000eb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001037f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 11244 bytes
SHA-256: 4434a5f0e183c3fabca37ae0c4baa8d67a5998ab68b29b725395728cd356abd9
font_02_sfnt_off00011dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEE 20264 bytes
SHA-256: a8b3a89fa28ea94330f17e83c6e6dd1881c070054f7b405b12c00893684e2a85
font_03_sfnt_off00015393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15393 16384 bytes
SHA-256: b5cba810ccacd47bd6dfe858c2b1274c49fc2e3fc3ae529cbb14c80a65ff9de5