Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d22179a78e127c4…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 05:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2dba95011a216b13203e63b43e3d4b41 SHA-1: 9a1d374ab6208db9557eddd263d648d4d17b6907 SHA-256: 6d22179a78e127c4a338d01c1ecb3c907deb092fd18d27b3788ed072857a5a79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS uploads or disposable domains. This suggests a phishing or SEO poisoning campaign aimed at redirecting unsuspecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://cbcom.fr/ressource/site-image/files/30359920658.pdf In PDF document text
    • http://abwpetersburg.com/uploads/files/pexenofekes.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/galifadoburupu.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/37139923520.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac171d1f36b---doxil.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/netilanidif.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a7a0356b1---78188522002.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/876b986356cf4f99e4a5c2aff6b62600/narefenitog.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/772918339f697ed51d5c10bfd09bac81/22990373005.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/sufosuwifupevajamesag.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161282f9299707---19519379311.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/81103516425.pdfIn PDF document text
    • http://qzgj.cn/upload/file/81879110158.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8811bea8e1493bd596062103b437d3a6/tumupotufapifiruwa.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/93315186087.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/purelefajuxapenusi.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608875813a983---22366625252.pdfIn PDF document text
    • http://uniquestatues.com/clients/9/91/91c6e204ee4529d3b478b0717040545d/File/22618626124.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/miwepiwazafudakuriso.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/27639216519.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2f919a8df---54532039084.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/9581776138.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/molagilaru.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/41641923487.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/ruweweguvivugem.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16098c0c10f46c---78202740250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=nuance+pdf+reader+for+asus+downloadPDF 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_off0000de9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9C 17912 bytes
SHA-256: b2a8e3f0f54a50a748a9b999df769c1ad954e64baff643176e59021fb43887cd
font_01_sfnt_off00010d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 10588 bytes
SHA-256: 9335eb3491e099dbd6af08c06de14c47385c68f89f6a05b0812eb3e29e232c83
font_02_sfnt_off000125c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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