Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9a1a2271db60b3…

MALICIOUS

PDF

98.0 KB Created: 2021-08-17 15:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6d0c775583054bb311e6e09aeade1330 SHA-1: 7a1e85ae5ea023e8563df73e65479bdfc185f07c SHA-256: 5f9a1a2271db60b33732748c2e78be817fc0f458dd3e63fe2cf752140eb75303
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://clintonseniorhighclassof77.com/clients/e/ec/ec6cde7faca09d53f5ba1fe44cd32e38/File/gobefokizosofe.pdf In PDF document text
    • http://topas.lt/userfiles/file/refuwufezijizubaw.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/dtf3f17s0kvn2pjqbe2c71ekp9/kapiduzozajagipedokidil.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/45834058338.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/bojuribexevufumikix.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/butupiluba.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114d479b9f89---xabelugewavowulon.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/tofud.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/39898693307.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/mawuxunupidotesekigobemib.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704fc5ca328---23912933448.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/65909004736.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/85429178286.pdfIn PDF document text
    • http://takeacode.com/user/d41d8cd98f00b204e9800998ecf8427e/file/doxesexidosugapiripes.pdfIn PDF document text
    • http://texmet.pl/userimages/file/69680264523.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/pexilovupuperekuj.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/4554346111.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/19627191566.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/8969a95c0759105d5bb92e5501e70fe7/60310068639.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/83375942575.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e14830fec9---54187610275.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/nofawezisexofelu.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/kilugamef.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/vodikiwovujupojavusorifo.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/sujotokigigigowiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=samsung+galaxy+s9+software+update+sprintPDF 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_off000118ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000130d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D1 11488 bytes
SHA-256: 8a386e67eeb8e0b98c2197f8417fc17466d7a6429bc5d8326c45f5e71a13c703
font_02_sfnt_off00014bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD8 17660 bytes
SHA-256: cb689cdda6ce579a0c6f0a85a0837af14296d849f2529a098c15dcc8d95d7653