Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba462821cb8bb73d…

MALICIOUS

PDF

74.8 KB Created: 2021-07-27 20:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 6f053d94624de82dca55ee35019c1748 SHA-1: 919b722c580af5bb027e0a999747efcf9db919d7 SHA-256: ba462821cb8bb73d2ac776b8e667549368559801fef6cedd127e2455818c8eb9
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as lures to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818003244fc---48575624586.pdf In PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16087c182cbfb0---wekenirabodenodavazoxe.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/58413778614.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/korebusefazivoma.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202107060545421329.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/vvlap3l8e6rvotko844vmgkb56/77474065605.pdfIn PDF document text
    • https://aokman-drive.com/d/files/zafisageb.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021624194855.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d51d7a5ee---movebunulixepepipines.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54aeebe8a0---lumidabur.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/e93a7cc2ada93538fd4b83085e36443b/ruzowazobojoliz.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e1f5457570a50d664c8cd0f6078c5ca3/90971937170.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081808539213---33063046467.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/d9eaac88640393961fd45a33e483391c/41819773815.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/30404564183.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/wagudemokusevire.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/39844621520.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/62120954280.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/nedurumasofafokilufujokis.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6352134c86---fetaxofifenip.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/serizipetisesadibevulogu.pdfIn PDF document text
    • https://tavio.ru/files/file/rutupekajelowolubuj.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/71760596126.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/vuxafazideforudoxibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=era+of+chaos+rashka+lore+4PDF 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_off0000c0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F6 17972 bytes
SHA-256: 371c6d4800fe54b9b3a071d32aa7fb88860c79bb2fec65dbbb9dc50a6b679faf
font_01_sfnt_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F8 10292 bytes
SHA-256: 918e7421fdce898f34895f38859612f93db0aeb431114d752c53fdad48f4af26