Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2bc7f74294765a…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 06:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 0c366882cfc680cae7a237d7abfd806c SHA-1: ecd479a3bb792f0ab22d32b260a3791b615b19e7 SHA-256: 9d2bc7f74294765a840c3ccd9638cf1e2d0808a64f8ab95b80b19387c68ecef2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • 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 https://pixomot.ru/uplcv?utm_term=would+you+rather+prefer+questions PDF link annotation
    • http://rajhansnursery.com/userfiles/file/53227082482.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/9ba3bbf8b7fad8ef09c27bf41788ca12/4876456139.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/pufozizevis.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c294d70a60---kexosiwexegavofebusib.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/dadijegibagup.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109fa9754a6d---59295913461.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/27440768723.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085569a12118---16454742895.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/70267322854.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/7hdcp7lo5fpe7uma5luao1181n/6812542371.pdfIn PDF document text
    • http://zzquansu.cn/d/files/foragogozu.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/29602174508.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/62354896944.pdfIn PDF document text
    • http://scro.ru/pic/file/74637579722.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/16768539706.pdfIn PDF document text
    • http://chikatere.com/Upload/files/beneweliwakiboxafamilit.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160826d5ca6e3a---17049923799.pdfIn PDF document text
    • http://www.asslar.de/downloads/59837472311.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093e477a46f0---25895961308.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/17681749412.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/98520231865.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160709e03ec6ac---nusozuponidodexenomiles.pdfPDF link annotation
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160887e85e5b9a---90496182439.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.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_off0000dd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD29 16888 bytes
SHA-256: 767c0d9ddc42467bd71ddd1811c2f3ae4ff3af21d49dc42a9a5beca93b46fe3f
font_01_sfnt_off00010829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10829 10948 bytes
SHA-256: 3a2bf7da655157cce7f7752c7ab8e2c1a22802f4ecb3395952148f0f075c34c6
font_02_sfnt_off0001214a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1