Malicious PDF — malware analysis report

Static analysis result for SHA-256 641598bfae07263f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 15:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: efc1d73b2633daa6f6b5617d41485c83 SHA-1: 84fadfed8c3e42db5cce234f91e16d1439486f06 SHA-256: 641598bfae07263f02dd5da0598fe30c2fe55a3fafe4c15643242b9445a1412b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to potentially compromised websites, indicating a malicious intent to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest the document is designed as a link farm to distribute malicious content or phish users. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://octvads.site/js/ckfinder/userfiles/files/57289268684.pdf In PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbd93af351e---20459229329.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/rolutotudekamikad.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/59979975375.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/af6056f367a3c719108a5dbc21e79c1c/69566033735.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/05lg93nhernpr30637qnu1tp56/fowikawonexojosirapekomi.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b25cc7a3e66---63924601175.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/52732011770.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/9811298561.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/dizedoz.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/zinuwuxetadiwofafizepij.pdfIn PDF document text
    • http://kgmda.com/upload/files/31290178535.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/43878507545.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/5e9d926478d4bcced2c01685ef1b98ca/52367656111.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/27ac9449db1514254926f33b121433a7/xakupojedazolerizabazarog.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/10c03f68ea6abeff815c96c2fddfed0e/kugolevokebutisazipogu.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/bodisejawis.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/56005713306.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/sj8u04b514lf69dpg8uq4c68a2/vijonururezusuxinak.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/44bccef40986fbf97b4005d0cfe39a38/67577371530.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/menivisezewegofubi.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/gakuxujotufit.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/85810463186.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/93374326990.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/9e40o5q34bmgacng9cqk3tf0cr/wuvedasidajuvupezedarum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=wenny+has+wings+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC3 10604 bytes
SHA-256: e72a144c9f178fa001eb79c8abbe7d36d79d0586fbc0d2fc74a5023b3b9f92d3
font_01_sfnt_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 18196 bytes
SHA-256: 2ba9d63f400afca04a3861462515596e1771f6c881089e3873609ae6a788e7ef
font_02_sfnt_off000122a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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