Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6d7ba11303cdf0…

MALICIOUS

PDF

62.5 KB Created: 2021-10-04 02:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d787eb8a8be77a053ff258a881118da0 SHA-1: 9eb343c6c7cd4f35d6104611590786f54b172a10 SHA-256: ff6d7ba11303cdf04f12249c6d7e40caca9be634035d304ba1f810a1d140be51
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a phishing lure, including an image-only design and embedded links. The numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggest an attempt to redirect users to malicious sites. The PDF structure and embedded links are consistent with techniques used to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3678

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 62 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://inwebjor.ru/uplcv?utm_term=group+of+women PDF link annotation
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/karakes.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/98065759948.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/fugiwofetirefaleririvusu.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/d90u8kkrkvspk3q15okpt486e3/45951996766.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/72de8e8abcbdb062241fa4ffd1e9a331/nuratitodur.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df9d61f942---nukelugorekixelavi.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/44666813698.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1632075298_d49007db8e.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/vavaboroti.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/mafalijurafunaw.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202110021613258847.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/xobatok.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/libiwopaxufaki.pdfIn PDF document text
    • https://labelmarket.pl/data/file/8157341480.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/38387678113.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/71986738165.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/86848382220.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/27889887594.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/xanisolixuwovatubotit.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155b59b1e222---legerululum.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210903_1BC60852647A5DA7.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/62003616668.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/58458854027.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210928105321.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/witonowekob.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/sakutuluv.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95E 10180 bytes
SHA-256: 3d1c26e414fc70f4f335b6ab16454ffa46ef639c5c013f0c40ff9962ba15afab