Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad7d1ffc54b8ed6…

MALICIOUS

PDF

81.7 KB Created: 2021-08-09 14:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 09c995254459637053274d700f257003 SHA-1: a4e4d3824fa400192d566af72690d87bcbc531ee SHA-256: cad7d1ffc54b8ed665862acc3370a13a7a3cf9ce95d8591d2c324c30c4531a48
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://krisoc.ru/uplcv?utm_term=kane+and+abel+synopsis PDF link annotation
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/em0lgumunf7vqkge0sbh0v4qs5/welamilujufimuz.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6ab60c455---89166703371.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/50893167734.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/88873268653.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/76652379561.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/bc06fcab0aa7778f7fa72b0d9cc70720/11556729786.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/89661687011.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb7b3789af---19258601779.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/58693867061.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609be4232ebea---gafafisewoxoneliwuzole.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/80192456927.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/4naiqpev5vgkab0qn5o4qev0pn/saseze.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/ziruzofagowuxesu.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/depatiroferugawu.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16105b37fec4e4---wawip.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/sumudofewojiwokuzek.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/84655319172.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/jolezuwimebiba.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/movugoboluro.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/c4808c4506dc5d53f8f13be66f406b0a/6068625147.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/41802316299.pdfIn PDF document text
    • http://buildinggodskingdom.com/webcms/file/74539568654.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160758aa58d3e4---17695015025.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/6c83ed9572ffb37bc2ed1aa37c509470/zidukumiri.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_off0000d9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BC 18576 bytes
SHA-256: 9293d5089b909be20feefca962cae9f4df2958c2cb046c0d4a4eac2d7f64414c
font_01_sfnt_off00010961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12178 10432 bytes
SHA-256: fc47aad9043d9ecbd56c33d5ea78a7bf994cf17776c943ada46938fdb7738c0e

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