Malicious PDF — malware analysis report

Static analysis result for SHA-256 793fac8ec32b9505…

MALICIOUS

PDF

79.5 KB Created: 2021-09-01 05:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8467062a81fdc35a2124b841b7bedcb5 SHA-1: d4d00bae9dd02afb9a9f82ac4e58b0d8e87f5dd9 SHA-256: 793fac8ec32b9505e55e891df22248f44ad909183efa5c15e3fe1f4c536b710f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are likely used to host phishing pages or distribute further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://wastran.ru/uplcv?utm_term=miss+i+miss+you PDF link annotation
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/a42h574bvve4nv5uhrjqs2l4av/zubojaxumib.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607704e216fe9---dufinalakitopenum.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5c0a27db3054debcaa7827e97d6206f1/34882609297.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d93c492c1---17997915289.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fb8b9c66e---23380624877.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160b04cc75b40d---52498825986.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/87546805664.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/769082d133b4d5b359d1282e6eb27d58/88503488006.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160855d92ac725---xegifogutumoxejam.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/8113404350.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/94331829814.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210502141132186.pdfIn PDF document text
    • http://ippon.lv/uploads/File/41071388443.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///83042051605.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/7tve220mn2q6mca27vguq844i5/49085023673.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/21829699345.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f99ab47eb0---kagixuxakeziru.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7b385725---12290809289.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/35vrm9tfvok7cth06sau30qluv/85666935724.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/ramafigefiwerozisixenula.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/nedijudogodef.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608057b8b3cd7---benivavejoxolomudirikar.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af904caa68d---49348812499.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/2f86f10711723a5df5d31ecb19bf69ad/tajojimavexifumu.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/jedivinasifilu.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_off0000d499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD499 17692 bytes
SHA-256: e25b94743bf2ad1f0d890df8bb61977020fd6c226ca441c1d7d73c54c3707d2a
font_01_sfnt_off0001021e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A34 9832 bytes
SHA-256: a905313fde6b59e95091f43970813e25fe7d68eaedcc5588edb257dfe91f65bd