Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6971e5b8858f10…

MALICIOUS

PDF

113.8 KB Created: 2021-08-10 04:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: add809aa8c49376e0f6656bcd19267e4 SHA-1: 6a841a8f16d0abfdeb97e8e14d65195f8f78c215 SHA-256: 4b6971e5b8858f1086f752e30069a5a8ea832eaa2f7f1ffa2fdb225d75c1603d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://coretry.ru/uplcv?utm_term=duties+and+responsibilities+of+administrative+officer+iv+in+deped PDF link annotation
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b585c41f7b7---84586724338.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/91924528459.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c6776d24a4f2e9eae958f5b71bb264cc/24250443849.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/26190202571.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebb6781295---85115462834.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/4798225796.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca596f1345---81578172860.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/90563359110.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/labipi.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/benitafaxoneketuro.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf810389e02---taduvirumaxuv.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/surapavinewova.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/75812c1bd4cb24bfd26b1787547963d6/23508266802.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/0726077f77f3880bd0f53ccbe1c532b7/dubofefomotuz.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/68154132971.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb24bc6b9c---70129925312.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d27ad5929d6---lowetodetuzetadidoxufe.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/hdqpihilspp4suqqlpkncg78oo/22956558340.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/webalupibogabepoja.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/25249038113.pdfPDF link annotation
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/gsh094inas9i5g2mgtcbsq6842/vimagenutepakita.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/xawodegoxojeg.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.comIn 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_off00015e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E13 11088 bytes
SHA-256: 7d763d4a21784778993e754e88ebe9f673d8d5ae78144354cfbc58efa175a242
font_01_sfnt_off000177bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177BB 16340 bytes
SHA-256: 4d812b692bccbbde224942fe9589679448dcd35217c01d0243318d9aaf1499b0
font_02_sfnt_off0001a207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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