Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7fd59fd6e1f89a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 13:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fdb83101b37eb6372ef3e01cc04403b5 SHA-1: ca76d167a64a5fd52cd038e23c64c05bd637568e SHA-256: 7f7fd59fd6e1f89a3c0e256961579a24c1c9ee2b2e5e17cd3f85af3d9ef50539
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. Heuristics indicate this is a link farm designed to distribute content, with a high ML score and ClamAV detection confirming malicious intent. The primary function appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/b614019b27c1aff2c0df3a53f265020f/sorokepevarifapuvefuvoj.pdf In PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec596ab79c---lenegituzipimenutojopul.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/sabefamuvaxakowixovasode.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/xupenemumugid.pdfIn PDF document text
    • http://519pf.com/userfiles/files/kexibipajonuje.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/deder.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/44528371696.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/lefupikugevobat.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088b80363ac4---62377861173.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/jamekopevabapitox.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a406816a597---94259005320.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/gapurakexalegebunude.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c931fe3413---rukuzoneb.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16113371800a02---sepasimubidiranunaj.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/sofuvewijofewetu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d994e505b3---gudumab.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/togedadolizodifir.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/ef94c02150abcc8aa7495f2aacb62ca3/22402861127.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1129983786092714f7531f.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/uk54q0ohinsvl8qucdutevs357/25478855877.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/xepeg.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/59218080964.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/zunanurugozikamowivet.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160abb4ad01621---88742363709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=oxido+de+magnesio+usos+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_off0000d4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A1 10824 bytes
SHA-256: 57f03b42066a6e8cae640a98d6574a558e9e93beccd465b30b7f9531a8fde781
font_01_sfnt_off0000ed5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5B 19904 bytes
SHA-256: 6f9dd9c0588c6961f4f0a57fa9d10ff266dbb84161068421912f412e27fcd7eb
font_02_sfnt_off00011faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1