Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba27bb617c6db20…

MALICIOUS

PDF

78.8 KB Created: 2021-09-04 12:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dc70e966b7589a94a8785a67fd3b6d50 SHA-1: 74637a8e21ce088db48417f263adbcc058142413 SHA-256: 6ba27bb617c6db20f95995ab662d562174211afc97209782240d30c4fd2296cd
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links. Many of these links lead to compromised CMS uploads or disposable hosting, indicating a likely attempt to redirect users to malicious content or phishing pages. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=structure+and+function+of+neurons+pdf PDF link annotation
    • https://bya-ingenieria.com/ckfinder/userfiles/files/jojutanis.pdfIn PDF document text
    • https://derfo.info/resimler/files/sinadutavesuduk.pdfIn PDF document text
    • http://chinazzjx.com/d/files/nibuxe.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083463c74983---30700200627.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/medit.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/84928677849.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095222716a22---69338581329.pdfIn PDF document text
    • http://benhvientantao.com/img_duhoc/files/pujotezalujudorafotabe.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/29795852652.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16083b24bb6813---gasino.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/70247258242.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/zorarumubijavofirufori.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/60578366110.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/53377730588.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758b0f13f0c---vojepawema.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/kakuzenomaxavaranilowu.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/i0fcfu8hs11jeaur4r6glpptbb/61328570252.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/ff2937cfb4427f18cf6581f5ee4479d0/mabelekaf.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/e6s7gtd4133s8v87ivqbql6g4q/faropewefudojoxodokore.pdfIn PDF document text
    • https://patc.fr/imagesfile/55193623855.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/030217163080.pdfIn PDF document text
    • http://congluc.com/upload/files/40134838621.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b0d977dbbc---18321098643.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/44525320563.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/zomipodi.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/95972248397.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/fomizobibitaje.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_off0000d2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A9 10744 bytes
SHA-256: 7e4c0b405e04581cd1c240473c7d72505aed59d253148af98ee4dae7fde23c59
font_01_sfnt_off0000eb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7B 16456 bytes
SHA-256: c9a19479ca6dca9478f5fc7b91d5248945760145fbd239918e670a550607d827
font_02_sfnt_off00011582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1