Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4b8eb7c5d4c778…

MALICIOUS

PDF

100.0 KB Created: 2021-07-01 19:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40bee60d2b3aa8e1e64dcf9cc523f4e1 SHA-1: 743af1ce43ebfe4df50c8c1857564964b6e30d04 SHA-256: db4b8eb7c5d4c778313664aed181fc80a533f9cbeccc0be28941142f9b85ad32
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised WordPress sites and an IP address, likely to facilitate the download of a malicious payload. The presence of a 'Download' button lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://huntic.ru/uplcv?utm_term=together+with+chemistry+class+12+pdf+download
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078226748688---66559378704.pdf
    • http://sixtyguildersresearch.com/admin/photos/file/64621767286.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8898aa4292---13310388044.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/201d43c4e7c626b33b7bfe3e5bfd25fd/31521570330.pdf
    • http://stfrancisfrankford.com/clients/9/90/9051900d87e3fdd5bc97eff612ac54c4/File/lajabedoxot.pdf
    • http://atenngo.com/admin/sites/site/documents/61735106017.pdf
    • http://benthanhsgfarm.net/images/uploads/files/serukitojegogulenebe.pdf
    • http://atek-ent.com/upload/file/26511731350.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/001b809163d93bc030ba8315efdeee45/josokad.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093a3b5d96ed---bezilaguvowifaripin.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/3m3n5ksn3f6l89oro0c2qm9cf1/46089833435.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/4230rcl4dj4li57cqhkj5okba6/bovusatovunilunenovunukin.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/7i6q4ske34fmm38len82jae3sh/xafegawuxeg.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e5d14ed68---3040274572.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608448fe8ca4f---jujujudesarusowelolodoz.pdf
    • https://aiwatopup.com/ckfinder/userfiles/files/44817492057.pdf
    • http://kfbi.ru/content/file/kixafa.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a40fa034bd1f6b0e4ab26a39a7b441e7/sijomopilolosozifa.pdf
    • https://profipreklady.cz/www/ckfinder/userfiles/files/7477796537.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4ac15db14b1d4e616d50de1c57b22c61/36062811739.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/7r7dthnf8vimribssqv4lh2vm8/89569762914.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/69m50rou9qbct937kvruhrjhpp/39560780884.pdf
    • http://hrt-foto.hu/_user/file/48133113180.pdf
    • https://textosolutionslinguistiques.ca/upload/editor/file/kipixufipirixagawamevix.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d8f.bin
0e723fee681f3d825066d6549aba4b45b8e0eac22d727aaf460376fc271b2f5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8F 18752 bytes
font_01_sfnt_off00014f79.bin
d1281cc0bb98296908f876ee6887969fc823a6775d1e5a306175e0f614476627
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F79 11400 bytes
font_02_sfnt_off00016a35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16A35 16792 bytes