Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00dc3f67bd1a5a1…

MALICIOUS

PDF

92.9 KB Created: 2021-09-05 21:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d8b3f16f0c54945703560e3f3aee315b SHA-1: 0637c920a5c16bbf77e72cc8696a9a26b9940b83 SHA-256: a00dc3f67bd1a5a1007b9232da342632e9604e3b9c4dd8113be6bf88430d1f6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on potentially compromised or disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://zapcdn.space/web/img/podborky/files/zekopevavuf.pdf In PDF document text
    • https://eviinstall.com/userfiles/files/pujadagerewananifega.pdfIn PDF document text
    • http://radfordhsclassof1970.com/clients/878146/File/pevuli.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/85268307814.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/moxuvoro.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/3469701207.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/pibogoxozesibaw.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/58460125460.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/davokaxivitomesalikipez.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/dozozabamogogigefenogume.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/66700657889.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/popijut.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/7138124651.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63d45c22a2---72662616900.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/14485250522.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d264476a74---7163531080.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/8f8d499a98e90bc5815e6459d858d44f/19344285319.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/0uvsr4pjhc2c0pgdu88oia128a/83278736130.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/feboluwipekibumuguravuf.pdfIn PDF document text
    • http://altinay-law.com/images/file/83741470260.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/sobesexemizik.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/wesuziru.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/ed84f7c983860e6c7995487b785a4635/wanalabuwinisekojavob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=rac+caravan+insurance+pdfPDF 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_off000103fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 10560 bytes
SHA-256: 9340c4a146773f196e817abda765d568b6966f93f3b03ff2f0de3d3e9b39c66a
font_02_sfnt_off0001344c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344C 19064 bytes
SHA-256: b660277a7ced63b0cdce43ad5dfa44e2564c2f01babd1dcdbb186136401bcce9