Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccdf939ec1fbceb9…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 04:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 683d65b5d8354b8461929563c376a7ea SHA-1: d3c0f88520e9640fafa796471896ae385b0dd1c0 SHA-256: ccdf939ec1fbceb92528bed59beada2898ebe1376045b8adf1a4e197c08964df
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, which likely serve as redirects to a final malicious destination. The presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest an attempt to obscure the true malicious endpoint and potentially distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/4a7a6d710b02685c40a0946573c5d701/meselegafof.pdf In PDF document text
    • http://kielcenoca.pl/files/file/6709698280.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/0abe8fabfe9add5949d516b822e80bf3/dezewelurudiwiko.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/vusuvezikurubopuz.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/9hpq3hb342co7h52mbi5c1sgpq/65113898113.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/52822552836.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/dc8060d6f42fdd5d3fc0fe1fc61cb5b0/lisinogujomovese.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075daf75d3f8---58847053668.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/tmo3d87lei50hco6cl8ibtqck9/61429430159.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5e60a01ae---zabuxirenaxujinutudolus.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/9b7563ff14fb87a181a15bbdd0c6c299/lewaxi.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/kiseninufamelaj.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2a642bb07---43111233844.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/nusur.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748ce143edb---tixeratimu.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/jifim.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d180077765---99602314398.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/ebktnqb029eedvdhd3b7tfluqa/14156709945.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/53944230354.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/lubowopoluxipupugolujaxod.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/464512588eedf869f163d14cf3c5ce12/113689490.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8394c4ccb2---sedotebaf.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/59734303561.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/14466885142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=4+minute+neurologic+exam+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_off0000d17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17F 10976 bytes
SHA-256: 9ee7d59e1039aa1dde77a0b51053025f406e3ebd2351270e8f38081b80e20880
font_01_sfnt_off0000eabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 23020 bytes
SHA-256: b901b078756fdcc3ee644501c0c177a66600400679f324c497f68acdeb6d0b3a

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