Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac62a28aa63831a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-10 08:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4698fe95430788019e37f78d2e6902a1 SHA-1: a3065b83642abd63fcee66ff7e6400d4272ad33d SHA-256: 4ac62a28aa63831a7765b86043b4230be8eca418286ed2ecff22997749a71e69
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or malware distribution, under the guise of document downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/29148666407.pdf In PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/veliv.pdfIn PDF document text
    • http://bjallstar.com/upload/file/15991057621.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090516442511.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/19405589559.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/21941623125.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/nurapimuzivakupixebom.pdfIn PDF document text
    • http://feg.vn/uploads/files/zenunujopevuvaz.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/murepojiri.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139bf5814c41---ratozezase.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/14332058231.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/5058452308.pdfIn PDF document text
    • http://artio.pl/files/files/78997441842.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/82168670538.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161365988609c6---fatuvoxudumaluxebelof.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161351eb7cdab4---vapunedijol.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/pijajopunolonafefud.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/86106298462.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/24014081378.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/lobazukatipumevajedap.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/51473857736.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/xofirodelorukitutawiru.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/jibaboterux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=document+reader+app+download+for+pcPDF 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_off0000d5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A0 10708 bytes
SHA-256: 1edbff05dbe9b0c8e356a7e2731e1dae56fea78c78093131b1a2823d227fee4c
font_01_sfnt_off0000ee39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE39 17796 bytes
SHA-256: b005866b661c0379fcc7b8d8dac4db6ac3527ba177c525ef67855ccb938096e7
font_02_sfnt_off00011c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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