Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b97140e328b45d…

MALICIOUS

PDF

103.4 KB Created: 2021-07-07 23:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ca3ae851d4dc5a9b4e0721b7427fe4ec SHA-1: 70f7cefd040443feed932994666a0139dc3f06a0 SHA-256: 35b97140e328b45de0c0065c8c8c0eeae69a8d5fd09ad9edbb22f4f44cd3e60c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9309

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 http://zpb-maciejewski.pl/upload/fck/file/guvomumirenifopesaw.pdf In PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/08a758c2a343e5a42b434921d891a951/5582651912.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/8402048ad7f3a96a5ccd469f3a179b2a/5984365093.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc18044859---57813813564.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ccsasrc53qjgq1f2unkticufpf/93648561034.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16096416ba7e42---49308122464.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/sozafo.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///lovedegezevisimoro.pdfIn PDF document text
    • http://cmtsport.com/pliki/99769820923.pdfIn PDF document text
    • http://canadanur.com/resimler/files/wimerekukerupa.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/2b01916419a44408348df8df642d2a73/boramevemuxidelewowigago.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/9db1becb3d3a3432b395f570816af1ee/wubovowe.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8476d2bdbb---wotugurebaza.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/t8mkm979e4l3t6dbs1m0h6heec/49690424291.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d768973e---91627152844.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/danidukogokefunumir.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/8k50t24cgjio8tmo5psp77ceu7/60836252030.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/18540661149.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bc72a750932---13649122106.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82b96a9d64---86987567121.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/ladexamelajobebudolesoz.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e86c2d0ae7---bulez.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/80107018630.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/47336328763.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccd50948b5---bevujudafidewafagonido.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/0kmabbc1g4n92re8h8qmpugpbh/sesam.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/60107818568.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/xasijotuxoripav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=jaggery+is+made+fromPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 2604 bytes
SHA-256: 8983979a94b9dfc73d3b543117e166d3eca3dc783fa283d0dba200c138d2091d
font_01_sfnt_off00010fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127ED 10556 bytes
SHA-256: a511df51d93d39921d687d4553c3b0e1eb65f62a5f1519b890a8c192dd737c0b
font_03_sfnt_off00013fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD2 21896 bytes
SHA-256: 585a884a757c21ca67d3e7304ff19a25e0ca1edfcd4314737c0f71da5fb6a3bf
font_04_sfnt_off0001758e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1758E 17448 bytes
SHA-256: 0bdb0a377f2f925a2221c0a92935c03da4096e5183aeaa43174e09e1a1a6bd75

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