Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5207633acefdd2…

MALICIOUS

PDF

74.7 KB Created: 2021-09-02 21:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: efad44cc436d7843cfc33ffcd12b0eed SHA-1: 14f2c0d1ad7c60632480c08450ed82610b4c3d7b SHA-256: 7e5207633acefdd217b1de3b0d6e1b3be01e0be9efaa9414f4457ded57344ac0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a distribution mechanism for phishing or malware, leveraging the PDF as a lure. No scripts were extracted, but the presence of multiple compromised CMS upload links suggests a pattern of hosting malicious content on vulnerable websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cka-shiba.com/ckfinder/userfiles/files/powowuwawategunifiwit.pdf In PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/f9ip2vfb53utgl2mcda8k0s3u8/kopuparomenilapi.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bc18b7fbb---kanez.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/14618144622.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16129d2bb8698e---9899879686.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/111fbc7f243530dbac46b2d117d7ea8d/82899582090.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7d6083b83a34f03d49f4d4e4700ea7eb/22890584887.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/63288772688.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9919d52495---kosarezovadidegitanom.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160755c42cc7de---12475168306.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080c80df2bd2---fuwojatetofomirerirebatot.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/923206239ddfa9029602969f6ac87acc/gopiwurunosefusamiwexif.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/49616194119.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/27b345923b0cb5fba4cf48ff7d21e4a5/kajizonir.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/2586480157.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/24e8c5dacd158603ec16103b3fcb9661/11976681489.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/kuwamisajadojutipibilek.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/388673e9953afbe3d881b7ee3db7d639/lajopegusesubutukokit.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/74970166737.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0df503a7a5---wudomenigorugija.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3a7a46e84---difeteriwaxoludefedatag.pdfIn PDF document text
    • http://asustainable.com/global/file/dotagizixuvunevetodapamer.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/58769994081.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ec849ddc67e3427414ed673c2e6046b8/pebokoxuvewax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=romiette+and+julio+book+pdfPDF link annotation
    • 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_off0000c7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BE 10900 bytes
SHA-256: 0623914837ba99ebc7aaa351ef623086efa1c90ef71b2c7a2d725a72e1da1ce1
font_01_sfnt_off0000e0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 16616 bytes
SHA-256: 341fce03488fc4a9aafb15fb59160e6935260674722f8343ac5ad681720a5e0a
font_02_sfnt_off00010bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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