Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cbb7b7ecdf5f648…

MALICIOUS

PDF

85.1 KB Created: 2021-07-29 18:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f14cea40ef55d2bea0e3e49b2db7e851 SHA-1: bfd1b0dac0f1bc523e39a231bf20ac5af8bdaeb3 SHA-256: 4cbb7b7ecdf5f64880b3a26902dc73a35091568d6247cfd01079b3dab1bbb5e9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically related to phishing. The presence of multiple compromised CMS upload links further supports the conclusion that this PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8f1424c13---somuwifa.pdf In PDF document text
    • http://christschoolblr.in/userfiles/file/99854640699.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/rdj182kl3c4eqsbingqa76cure/ritejibotu.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/kusobapuzixixi.pdfIn PDF document text
    • http://industrialdevices.in/uploads/69962448018.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a4e80fb5f76e9a7c659210456d7f65b8/lumexededinurubepitu.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/eddcd5fd98d24437030552f82bf5faa9/65469085417.pdfIn PDF document text
    • http://holzbau-napetschnig.at/15635310501.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e6585e54b07---38877020261.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/nijixapo.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/26943673243.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/g77me3m955bmviuko16vcrb9v6/vetudimidewim.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd25354cd1---dibevekaliragatizamuxi.pdfIn PDF document text
    • http://northcity.rs/slike/files/mitamiwuxovosijuxonasoli.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/12cbf5d599dc6f85b56a850964ad4e58/41544232325.pdfIn PDF document text
    • https://solucionesinmobiliariasavg.com/ckfinder/userfiles/files/47006668894.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/16114388250.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607e663c6e459---kotoxiwikedunoxa.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/nodabufulef.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1890708328608f50e8d4690.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca07452442---dodisabarofixemukufa.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/wagiviwukog.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/5e21f4a371e2b27276ffb5cbffc503c3/napupetamelokelupi.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072efed938c4---87411292631.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779450dddf3---21810816969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=introduccion+para+portafolio+profesionalPDF 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_off0000e4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AE 10664 bytes
SHA-256: e77c423b14a4f991ccc7f27fe7d388bf9a09a09125da931acc47d04b2b828c2f
font_01_sfnt_off0000fd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD40 18628 bytes
SHA-256: dbc41efe7c3bfe4de66baec8165d88ae8b2f9d65c244709b4fceaf400594f827
font_02_sfnt_off00012cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1