Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47330ca7b0193e5…

MALICIOUS

PDF

68.5 KB Created: 2021-09-18 02:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de423178147c5272b30e5b4dda606d96 SHA-1: 23022098f8ed1584b4dbf64ca6966e5c8d3c2f58 SHA-256: b47330ca7b0193e55b7e4a828b39ecf534c2d820d4dacef9529174d24d1847fd
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The numerous embedded URLs on potentially malicious domains support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://air-separation-supplier.com/d/files/zanozujewofivalevabuxined.pdf In PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/kowalisegajen.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210906050152925.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/jajasabujude.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/wuzerazarigavefam.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/nikibelojiwogawunaxalotu.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613be3bb69617---gawobazanul.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/92130928103.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021091805071173499.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/13909254496.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/bitajoxiwebuxarog.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/poretinapojetiwe.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4d39aac0e---18852723563.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613690cf6c30d---93809816605.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/35231465927.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/22687420963.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/mopaba.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/18223403441.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/23662185209.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/nokabusutuluwezitoluf.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/lelazufika.pdfIn PDF document text
    • https://haidangpc.com/contents/files/xesusugumokazadox.pdfIn PDF document text
    • https://phukienbep.net/media/files/gonivoruwixu.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/87235638909.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/jikokibugovatikijowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what+is+the+collective+noun+of+treesPDF 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_off0000b0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F2 10592 bytes
SHA-256: 2e7524f333e94fd513330c54d1ccbcbebb9cd45d086bd944cc490a1af5f372dd
font_02_sfnt_off0000e119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 14360 bytes
SHA-256: 0faebf46efa72b73409217a4d756f482dc29ab8fd3a19c735e11a004569dcc38