Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2fb57467b471df3…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 13:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0bd998b697f7ebcda20744659d0dec60 SHA-1: 6a527ccfd34c1a724d09758748d9816c075b0d55 SHA-256: c2fb57467b471df339d51151f181c53a93d9136617d931027fb1c7cdb7e6afb1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, some pointing to IP addresses and compromised CMS upload directories, suggesting an attempt to redirect users to malicious content or download further malware. The presence of a link farm and SEO-related heuristics indicates a potential phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613670f75c9a2---zogoginone.pdf In PDF document text
    • https://produktybhp.pl/pliki_user/File/30533017116.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/43903795466.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/29444595838.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/18373643483.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/tawudunowokewamajulegi.pdfIn PDF document text
    • http://elskenecologie.nl/files/norenixukosamorogugaka.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/27182637898.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/48kolh400uqlke6plgsklnug05/mufelugajubife.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/33142171953.pdfPDF link annotation
    • http://villa-margherita.biz/userfiles/files/deziramimomuwuzazaza.pdfIn PDF document text
    • http://vucert.vn/uploads/files/85526726102.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/91144574362.pdfIn PDF document text
    • http://maulich.vn/attachment/files/vatusadewedaripu.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/wajuliselag.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/dubadod.pdfIn PDF document text
    • http://rapet.hu/files/rivuvomebotixakox.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/86229769174.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/63782121343.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d6c822ad4ba52b491ddef7fb2cbb51bc/11442581548.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/20766045314.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/veseke.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144d13f26ec6---tidikumafex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=malang+movie+onlinePDF 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_off0000d7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 17272 bytes
SHA-256: 1ac1f489cfef379518f3fb925012e9a532a691ffcad856953ddee40540f4cb66
font_02_sfnt_off00011c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C11 10144 bytes
SHA-256: 795262a372a30d8bcfe5885d61bf1c4656d27188a3b32405460890df4b95a15a

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