Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd3f5a259678ab5…

MALICIOUS

PDF

90.0 KB Created: 2021-07-30 17:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 79d424bbb9b02bb5a6275162445835d0 SHA-1: eeb513c412bce41e1db04ee08c1d5af52d9985c6 SHA-256: 7dd3f5a259678ab5684a57eead69d32d00ab0e3639ed1fdb6ec61c5c667c8d12
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further exploitation. The document body is heavily obfuscated and appears to be non-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://benhvientantao.com/img_duhoc/files/fojosidojatafosa.pdf In PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/41043826070.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/23263091640.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5401d093c---zijixadasavapijo.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/bba3b1be3c8eeb5054f2e3516d0479a3/dedenaw.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/a8bo73hgi583qvkurqca8vcklo/5351567323.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/zarebawubovizuzafefugeri.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/l1202bs7ogqa5likvfkku4930u/66723722850.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/d8d53ae156a7756ea1f5a499a8f964d7/57297014333.pdfIn PDF document text
    • http://stevis.cz/files/file/22512207789.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/25102218260.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/86153359903.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/85337417589.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc09861066---liniwosogutufalarewak.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/rigepowixozafi.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/33glbp7f2afufgaiaftl7mmc23/82045259858.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e93c2b61e90---satujuwufu.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/65574166215.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb266aae6e---2265215453.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/kodubeganatogozerona.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/riwutikepabezogug.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/b3be7bb6d3028d762e40571325dba595/pafepizujogamuzutekajebo.pdfIn PDF document text
    • https://purefeeling8.com/data/file/povuruni.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160afe271a4bee---xurowegepozajokanovag.pdfIn PDF document text
    • https://combrooncom.com/contents//files/53593632128.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/84539164717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=corel+draw+x6+tutorials+for+beginners+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_off0000fa71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11288 11300 bytes
SHA-256: b0e0d3d107ba9b5b4ed209f15d3b0f97a34af99da8545c83604f4a73778e447b
font_02_sfnt_off00012cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEF 17332 bytes
SHA-256: dd4fc6bf23f5bb9d63f6fdfd269345921ebd711bcab18f415ffff3c9b73ad624

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