Malicious PDF — malware analysis report

Static analysis result for SHA-256 965d826a4185871e…

MALICIOUS

PDF

79.9 KB Created: 2021-09-04 08:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 519e83b6dc07e3e77ef8b20dfb4ab79e SHA-1: d0aa0a35dfa0880f43210a3ca4f453bae473c4a0 SHA-256: 965d826a4185871ea07c356a9b7c740b626a686e81e977700c138eab816126c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farms pointing to compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is unreadable, but the heuristic firings clearly indicate the file's purpose is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://coretry.ru/uplcv?utm_term=academic+resilience+theory+pdf PDF link annotation
    • https://careoncall.in/userfiles/files/voluwuzeriwemomuzakelemem.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/bakulanifugozopiwi.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/jezoxakepubifilus.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f7c80b5b---pifit.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/jumepowivogo.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/somajobakizireligesafar.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/b3eb97f52dece644742cf1cf8affeb16/561266730.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/vp181drukadi5e5rvu94821v03/paxeferadibilepij.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998ff89e302---39295410298.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/7368faeeb3aa7f3fd00e621668fa1604/17813734358.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/zadawironolizesulimivaz.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/3b526d02beaef5bb05e1a05eab049164/mizuxagavedatizepafidamel.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160962bbfc113f---safamipiwelopem.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210628191515.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/11302102095.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/divitipevuxitofax.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1610e6eb3904b1---remitawapugazapakepidawul.pdfIn PDF document text
    • https://actorconseil.com/files/file/53800787993.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/vivijakifire.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/rajafojorarawa.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/fazonewanonukalatux.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/5gn267jfs8q9g5jeqqdoq06pu7/64878612067.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/dda0b68332fad44291b0398f6460807b/nulatenexomumadufo.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18583fc34---81719581343.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/31739716237.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///53435181390.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_off0000d1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 10980 bytes
SHA-256: 00cd27ec49869dc5d6cfe92dcdeb96dbd9a1f4d7a2757295676538434625f193
font_02_sfnt_off00010326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10326 17956 bytes
SHA-256: d9772f80f697ca0f18a4400be02bb985102e536c27b7ace395ce288d13aee289

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