Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b43bf45a4153456…

MALICIOUS

PDF

71.3 KB Created: 2021-09-20 11:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: acddf904147b9f864a01200df715f891 SHA-1: beee9bf9af1f21663cd9c64f0d5450699f29b423 SHA-256: 5b43bf45a41534560cdae1cc0722b4171b5ca1bb7d4f63505382c2ecd3662700
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303af07b7b0---rokag.pdf In PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/72833802596.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bs8uaamuj5vhbhbk1q52puogd7/vejitepimesumoke.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/3211854281.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/pexefejawaferupet.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/62729216521.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/40924335908.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/83501657378.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1614343d692df3---pofevitiguxutozudu.pdfPDF link annotation
    • http://www.thaitofu.com/image/upload/File/newujolezafapekegeru.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/musimuzelezixejunez.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/gizuwedorobijemifuse.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/ximokesikerad.pdfIn PDF document text
    • http://halaljones.com/uploads/files/labin.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/voruxajetujubapu.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-4/20210904013207117797.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/21142735936136ca7c12592.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161372e509237c---ketegeru.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/jipebipifeleniz.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c50527aac1---kakofuja.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/robufuvuxili.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210912115314.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/57121761718.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/b65jbsqdb4f3lei5sf9ukk1ofq/xevalu.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/49154583475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=freed+full+moviePDF 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_off0000b6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F2 10124 bytes
SHA-256: cb7b6a68cb2fae29387ae11bdf8518cff3f723bfacdca54aeda7c8857b70c901
font_01_sfnt_off0000cd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD82 16420 bytes
SHA-256: 148553c5ac6f1a9f16296992bd3867a9d40d05b1f905ee55b507d86425b86408
font_02_sfnt_off0000f7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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