Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c6f04aec7c117c…

MALICIOUS

PDF

70.9 KB Created: 2021-09-05 04:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 24b0e598b2c729b7d657d16b8abfa1f7 SHA-1: 2a58438b056c1b19af527bd9b3ef888c0e98c13f SHA-256: c3c6f04aec7c117c4497bfdb711d327b6b05a6d65c7f43e2e9d2bab3f1e87447
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload directories and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise, pointing to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/356039d2da3d196462604599114d7ed2/vugimapuwepizopatexuto.pdf In PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b5e986bf8---14538173247.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d2218acf23---9578371049.pdfIn PDF document text
    • http://vo23.ru/upload/file/664421163.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/sigibevemobotusobovape.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/jasegor.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f54d5ea40d3---85319726284.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/livipinowewafuzivajumiv.pdfIn PDF document text
    • https://khanikango.in/file/4191132308.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/29342138922.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/27089448294.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///xasoziburulidafodo.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/21131589355.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109042359382528.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/pugenudiwi.pdfIn PDF document text
    • http://st03.it/userfiles/files/74980116095.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/78201569150.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/8d7d1c2066128262060a4f57159b6399/sazuzenupopexuwovotexoro.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/69834510394.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/detogatovexofamev.pdfIn PDF document text
    • https://rjpexport.com/files/zaxodag.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/xumoxovigivinonisigozi.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/f4s4v1nmfhjdgmm53j13l54oe1/43267404107.pdfIn PDF document text
    • http://jinyezi.cn/upload/zesufilixinob.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/kuxunowemunepebonir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=quicken+2019+instruction+manualPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b94af6bdf983325221bf69ef6519a259/96703173205.pdfIn PDF document text
    • 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_off0000b7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A9 11104 bytes
SHA-256: 710692caca90530c8fefd73d539a458337b344e0b0910d94047713f3946c44dd
font_01_sfnt_off0000d1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C2 14588 bytes
SHA-256: 9d411dc7b3772885394de7b27c479f47bd3f487d30867bc415877f4d168e49c4
font_02_sfnt_off0000f5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1