Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4fec719286af732…

MALICIOUS

PDF

79.9 KB Created: 2021-08-27 19:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 67c8a119d0efb9804db7f1b768ad6e5c SHA-1: 0c870c333352834476c7d3538a0f80062a9e86fa SHA-256: e4fec719286af732fba999134b40f6fd1f22015dc05fb1e0a7f6e26e964d40eb
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised websites, many of which host other PDF files. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF acting as a lure to further compromised content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://faw-asia.com/image/upload/files/jimegitotajemum.pdf In PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/363d551ab799c78f8c0d2f1ec9e3c47c/pukonaxozaj.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/kanedisikidivigajebaboboz.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/rekobomuwezezojavu.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/24499116634.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2qg6jsl26hsaecro4pupbnc155/dukazoginijopowagidogeze.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/93099939054.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/8dcc1d9308c0131a5e6abddb7c9589f4/tademekalurivonut.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff29b3b1f3---pagekobolibe.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/nelaxazada.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/zitofoz.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/1dhstdrkrlveb4oqoh8jfik2td/24755810385.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/a4896da36eec36e186aaf2b3d608e26d/dagidope.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///2434438200.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16126d84cbe413---38871356667.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837f4825673---14080674979.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210803_8F863460C72BBC6C.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/50116011724.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/8732663968.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/cf81c1b89d8c67fe431f8257103e585e/21084418557.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/musosufumaret.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/wezogopimo.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/bomavanuxofurubudelefeped.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1628542709.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/wumuromagewejomovose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=double+replacement+productsPDF 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_off0000d69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69E 10824 bytes
SHA-256: 8d5c09475342f2ce691e9fc92e1f81c4478c403786da4fb436741442fb06d0be
font_01_sfnt_off0000ef60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF60 16104 bytes
SHA-256: 8a995c9f1453e6fac9748b545c83a5e41555d9f2116673a381744ff62948fee3
font_02_sfnt_off000118e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1