Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f7db7a405bbf48…

MALICIOUS

PDF

95.5 KB Created: 2021-07-02 09:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b8252a9dceb1a0ed9ff69b2d31aac4ad SHA-1: 4e2b8bcf9b2053a2ed6d890716be9703d3d1e491 SHA-256: b8f7db7a405bbf48e7b10289042f8f2b595d75638f5ae132c974a1974ac8f824
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous links, many pointing to compromised CMS uploads and link farms on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of these link farms and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/14256b93529f50f44f24fcfbb39f6b61/73711287851.pdf In PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/he4ht7l861egl6gj3gc4kp0tdc/mavamez.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/6ac38c6cded0328a9794db888c78e1ba/butipoxesavixofixa.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/43025361289.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/72671839462.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/tasidupemikumepati.pdfIn PDF document text
    • http://beateromer.com/bilder/file/65190097655.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ib36bkoc3fktb14tj0prtc7as0/rotowowomijo.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/25a88fe7acc207b23274681d16ce4eed/kefabuvizebunab.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c44ba1cd55---rasebojuwiga.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///logaremubofozixakevef.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792ba52901b---xasixexuzidesa.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb204612645---moxugeda.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/92l6g90r8u4lhs1orc0o54tqv0/72644983698.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/f229903ed920a2e6b56c48ea3664d096/50088108803.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/u3j5kc7n7vllikb41hn3ucrnbc/dopuworofofutiwuzowe.pdfIn PDF document text
    • http://k1a.ru/images/files/file/37870367954.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/fec3abedf5b3467c49e96169685661ef/dolefutapokab.pdfIn PDF document text
    • https://aspirans.com/files/file/nilafi.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/hm5rldf4ubi1k7vqspaf3omfe6/xokeloluxogujikenene.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160948a7426eda---79224362451.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/23805120412.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/20181905986.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a16ee99730c---4945191904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=get+off+meaning+in+englishPDF 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_off000110c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C3 18684 bytes
SHA-256: a77a8f6c2ee113560de97d2a1d7438c481852288b6d7550a594b31f75b898ea7
font_01_sfnt_off000140d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D5 10600 bytes
SHA-256: cae0b3f24e32073eef4af882df671ce7b3121a3373e918d4e20a4ac08e1bf142
font_02_sfnt_off000158e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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