Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ac254442924403…

MALICIOUS

PDF

76.0 KB Created: 2021-09-08 08:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee148ec145d54217583f316b99cfa006 SHA-1: e414bdcb25a4f4f411a4247acd2599604d5e121c SHA-256: 36ac254442924403e9686082c7cafab7da72ebb7e8969145eba7c9e2c92d8406
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://inwebjor.ru/uplcv?utm_term=possessive+pronoun+worksheet+3rd+grade PDF link annotation
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ppi33o0pdjabtn99vnc50jvfui/26091168297.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/rosunakojerufepizep.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/34107562136.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/130acf7b50e6ca1e34a0a9288ccf7473/pofosow.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076d99f85a8e---54189795188.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/79520596902.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/40101212156.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4ddb7fea7---kumap.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/0e337f3f4dfc0a1ce5ec2e34d63ca962/juvujilerorovexuvogumi.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/seponukulepajoxixowike.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0600163d---wiwajofuku.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/697fdc60c6920419df2f1aa01952d0dd/nirarulobujenur.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/falotememububemewu.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/zolovazikusaxaraf.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/78mr6adrhe59vuggcombm2sshj/xipelulawijonaj.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/29610365891.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620443629.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c79183b587f47d06e6c88364b07bd524/jefirevopezaxudomabosuj.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/35147153303.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/xeboropurenofus.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/penoxepopinebukawopunow.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161194b5506b10---19054794734.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/moladako.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bf54dccd3---duxekejojusavituja.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_off0000c2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF7 17636 bytes
SHA-256: 2618dac52faa0481a419f63eac8b90a714f37da3787dcce8d7fe55e1fcf8f6d8
font_02_sfnt_off00010855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10855 11144 bytes
SHA-256: dfba2b1965ecad29252c83d374b6bc313b94761c271d31a6d6e2e3fa9e97a3f3