Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bef9b30af4b066b…

MALICIOUS

PDF

78.8 KB Created: 2021-06-28 12:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b4b13257ae22f29c799cb4922efa1259 SHA-1: 0d20e774a0647bf8ca26a66178981706a6e4aa58 SHA-256: 7bef9b30af4b066b1ae0f419f3b0b85550ae4ccbaf8f7b06d74fe48e27ef45e1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The heuristics indicate the PDF functions as a link farm, directing users to numerous external websites, many hosted on compromised CMS platforms. The presence of a 'utm_term' parameter in one URL suggests a potential phishing or SEO-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=the+scarlet+letter+korean+movie+eng+sub PDF link annotation
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c4d429a3f---56698991209.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d0c2e957e---bozomudiregivuveko.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e07fa4b685---12673121497.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/94691216657.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/38350659343.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecd3eafab1---pipilekeva.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/18424765548.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/pakugamafuralidufiwebebu.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ioeegjvk1duqpehncbgf3cdh94/muniremorufesi.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/2eg8o8l5qh5pe18l1dpr525cig/lamilufotesulopinofitama.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/32142849849.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0974ea23f2---92718200236.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/danugilivatapuj.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/3d26f019a2528327c55f37410e51f46d/33501180982.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/68429716250.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/guseziwudo.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/nabaluzapi.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/16e3faa0915aef30729f286a86efecd2/wipegaxuzonufevovarav.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcb62d6a72---14867765139.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16082bd6d4529a---xinagawetexa.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607697fc687a2---93210955974.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160af89598340d---75191591739.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/fijixuvonoxukidugeweta.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/fead00c9d42be69b767650b838a4c4ce/sodivoterawu.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_off0000c351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC351 25780 bytes
SHA-256: 9f468237edc5b854840b6313b024b20fa9e8fc29cc3a42d47bd46252137b31a6
font_01_sfnt_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11216 11040 bytes
SHA-256: faabc8aa4f5e61a09185e0902541bc4cc44137bd5ec2786c25e70a67539376d3

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