Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38ba3fe3a04a8b6…

MALICIOUS

PDF

76.4 KB Created: 2021-09-07 13:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 165c1b5dbbabf0e78530398d6c27e446 SHA-1: fc60c81f5e98f0ed3a04a4c35344dcaa87ac8e9c SHA-256: b38ba3fe3a04a8b6e93a6300a3794e538e3c1305e5c88397020a4cfa3d2c7c3e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a malicious intent to redirect users to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://termofriz.rs//files/bepekereravafur.pdf In PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/94165521564.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/f7808e40fbb36027f7c25d424a6fc24e/17522181013.pdfIn PDF document text
    • http://tdfinalists.ca/clients/43449/File/saxubojedilizituzojesu.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/zevifajejeputovikexige.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/c86cecb9baa14f34e3986527076b9387/wodutulavewes.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/panozigidixojebek.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2fd9bc6c2193dc6b34712a599d55fde4/24325447542.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/18740582026.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/ea4ub5lan4ud2ivf5ck1vk8fua/bunuxogetilisemedupikul.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/34898208756.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161307808c8f18---nagoteraf.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/luwiwa.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e459a39d2---surubefisogakabexujura.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/63224495913.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/41hg299fr1r0f2f3vn13blke36/47683208931.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/76198221069.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bade37d9e97---sojow.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/63039389616.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/wasobebitu.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/mifuz.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/27050368098.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/da01893203446a6cb40cc325f4f701b2/17788096568.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/tetojokamumozaw.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbba28f9fe---21275246073.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/20568433452.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/e3e544ed3bb1611acb42c0a0c11991b4/wosogik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=rcmp+polygraph+questions+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_off0000c936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC936 11472 bytes
SHA-256: b664cf3c362dfb0290416d6672f407d8ad71ce2e5687aa29dea284143145820c
font_01_sfnt_off0000e3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A9 15752 bytes
SHA-256: 42daa767210cf2cebc6161f964749186980d6d26ff1cd2b8ddbd4faf0adaf61a
font_02_sfnt_off00010bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1