Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b547ab672f1330…

MALICIOUS

PDF

73.2 KB Created: 2021-09-25 23:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c18b29c1356620d099bfc6cf3945e84a SHA-1: e9e8001468633309726bb95a011e7643375bbdf0 SHA-256: c4b547ab672f1330e5be49e19335ec60675cc24e6dc9c793b25583d6ad9217ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many of which point to potentially compromised or disposable hosting. The presence of JavaScript suggests an attempt to execute malicious code within the PDF, likely to facilitate further compromise or redirect the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cassotech.nl/site/data/ws/files/39233124928.pdf In PDF document text
    • http://ros-audit.com/i/up/file/gitaku.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109040521019054.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/56898398088.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/wozesa.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/zuzovef.pdfIn PDF document text
    • https://majubesar.com/contents/files/zolexakam.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356a9d5b5cd---gasajofowekux.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/beforazibawijek.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/8855425514.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/41dc608dff74126397fca785980239c0/48017923601.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/joredutejod.pdfIn PDF document text
    • http://charontrade.hu/data/file/reralulapozudu.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/wivubodofevijit.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f8197a022---jixomukelavamilaj.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/21253828546.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/nizilawaf.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/kaved.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/50725728553.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/90195284985.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/vugaboniniliwud.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/29443082140.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/merepisivusuraju.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/ginilupozusuzafibuvosin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=sefan+ru+android+pes+2012PDF 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_off0000b51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51F 18912 bytes
SHA-256: 878b5c413929c1418c0579eab5573092f61bd0f642912c2343e387e893ee34fd
font_01_sfnt_off0000e592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE592 10816 bytes
SHA-256: cfe1da93317839d09837db4ea56784584c416526d9dc9917e706929b58340409
font_02_sfnt_off0000fea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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