Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a0d578d9d1b5d85…

MALICIOUS

PDF

84.2 KB Created: 2021-09-09 15:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0397f1fbb5977818a3b0143e64f2197b SHA-1: 3b618e8e57f6183eeef646bf095d5dd3d7948d2d SHA-256: 6a0d578d9d1b5d85e692ef7890c0a50ce1c794ded97f2432a937ccafb5e1e747
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body is unreadable, but the heuristics and URLs confirm a link farm designed to redirect users to potentially harmful content.

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 http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3255e5f14---92902047243.pdf In PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161376f8ad7116---kiziz.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/33442103563.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/zipulekudo.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/nesewitutaw.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-03/fdcbc7be55d91573c62b893aac79f67f.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/142883a333852edf0406e0369a83e3ba/50383196074.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/947ba91ad7b55a39fbe08ccdfa53187e/64089131086.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/guketinodibabaxeritutu.pdfIn PDF document text
    • http://berbun.com/user_img/file/85458552001.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/luderudedera.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/74242088514.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/lulunugovazogikeduwap.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/zukezovoxufelogonakivarot.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/46159866170.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/87793987612.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/67943609719.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210907123210.pdfIn PDF document text
    • http://123dvere.sk/files/file/dedixifowewetiliwotetewi.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/ronefekezofodevad.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/85249015187.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/31224048631.pdfIn PDF document text
    • http://hopkim.vn/upload/files/wavamabalogowesejexexerej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=carmageddon+android+apkPDF 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_off0000dfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA3 10548 bytes
SHA-256: 3895af232608ab815980afa819fdb430976a78af315ad3f40b536aa5de54eac9
font_01_sfnt_off0000f761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF761 19848 bytes
SHA-256: 59b91d4969bac9362c69166435a56ca63fb76d6d4234b4ceb6df960996d951b0
font_02_sfnt_off00012ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1