Malicious PDF — malware analysis report

Static analysis result for SHA-256 69a422255d6062a5…

MALICIOUS

PDF

90.1 KB Created: 2021-08-16 19:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 564ea56a885c965a847527d485075d7e SHA-1: f57b2765de129e1e979f4fcb7327b51da5ec8e86 SHA-256: 69a422255d6062a5eb301865aa5b0be4a1e8ac8a24bfced267f6297119d941a3
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis confirm its purpose as a malicious link aggregator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://medvor.ru/uplcv?utm_term=clases+biblicas+para+ni%C3%B1os+la+oracion PDF link annotation
    • https://ehbo-oostkapelle.nl/userfiles/file/64170946605.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084ddeeaff24---13514629835.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160df409b2a0a1---domufabevamiwod.pdfIn PDF document text
    • https://isosklo.cz/uploads/23984205269.pdfIn PDF document text
    • https://cecprint.com/images/file/15324387192.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb9b84d59e---42447949633.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/77172769987.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/46659586429.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a628b462d5d---61093722851.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dd8945731---lavufidanejogabo.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/22911677520.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/jilivefexeravakirakig.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/0e5f071b0438b3000951e64a21c9f6ac/kumixuzirukevoradi.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf58f697c4---77517753013.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/pipifiwazedetaseru.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/manamarurevutute.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/7db9612c8d73de2b7dff00973f1941e6/35042030060.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/44886892219.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/b4k3aghuencv1jehqbt4gpoeh5/58741788936.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/38039508225.pdfIn PDF document text
    • http://belv.ru/userfiles/file/77214123688.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/siwemixutemupaledetewik.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/nukabafovifakivapo.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210719011431.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112bb506593f---zidaguvo.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_off0000f777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F89 18896 bytes
SHA-256: 1d8a4e65e1929b4ce307b0da2890b8eda79aaf1f4c253875d2b2bb7968f09497
font_02_sfnt_off00013fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBE 10644 bytes
SHA-256: d78bb455d0b54a307fa70c6407a619f0186c266a379112d1534a27d27eaeaace