Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2391cf34dde2373…

MALICIOUS

PDF

88.7 KB Created: 2021-06-28 04:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 40812501f16d199eb2eb4f4dc4bccd3e SHA-1: 0996876a43495a0a082f7dd8448a9b6907d08164 SHA-256: f2391cf34dde2373a956214d7ae403e4baac95aa4188af28b385c887f0f1ff1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF, as indicated by ML classification and ClamAV detection. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=blueberry+cream+cheese+galette PDF link annotation
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/968ef647003ea161b20a40fce960c2a3/wizoraximefilutodib.pdfIn PDF document text
    • http://airfa.it/userfiles/file/jamugobofipopo.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c24329ce---84453619613.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/11471505779.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7b627008d---89226841638.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/88761734360.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d07e02974d03546c66c2381197c1b9ea/xewuziladewizuleful.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/2932647189.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fdd01dfb1---fuvewapevima.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085a8fbeb4f0---tipetadofixekugosedunig.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/b377b1d028c1abd15e2d847cf93641a3/42237146838.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/74958957744.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/gisedederef.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/7203362548.pdfIn PDF document text
    • https://unosms.us/userfiles/file/garox.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/69735495505.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/kukc049o3l9np6u7lsuk6q49l0/77214045410.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16087c849d1482---44705473135.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077415a40cba---42589240866.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/k76ollldtes6614nkcgqd35coa/joninizileneselinivos.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/b89a2da25a010b7c574eebf2a1911ba2/tadatalutesaxigodujo.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/goxewaxekosuwu.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/2sfhm3369d7jnhuuq2mb2st9vr/38107775833.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7899213d8---fadojomagerunabevavidov.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/5f30341b9ec92b6af337ac3ddeb68a35/fulelakapusinurun.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_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 17144 bytes
SHA-256: 7fd8f8fc91f230502af1a29a639da77f694d49cdddff2120ac192af267664f4d
font_01_sfnt_off000122c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD8 10768 bytes
SHA-256: 624ea8a7d6e72609ed8cd0c6117ac2058d0c54ef018d35dc858be3be70ced0db