Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea23e9f63fff6214…

MALICIOUS

PDF

95.4 KB Created: 2021-09-01 05:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a3cc94058511d0e085aa11649401f67f SHA-1: a6ebec32fef96e8f844120cad8e56fe4a25001eb SHA-256: ea23e9f63fff62145f12d0a4bf8b952490ccc38cac33231e9bf1b34010c5dfcb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate the presence of embedded JavaScript and a link farm pointing to multiple compromised CMS upload directories. The primary attack pattern appears to be a phishing lure or a redirector to malicious sites, leveraging a link farm to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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 http://zxsolar.com/d/files/37952274852.pdf In PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b267916cdb0---17589039074.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/zonew.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/rjvpgo9ueai73k6ll93lv0pj5j/fizosoxegivexakutanazum.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/gefutaperar.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/sirijapaxugozibuka.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f19c6e677cd6a0deb035718dff3ec44a/79140709305.pdfIn PDF document text
    • http://asustainable.com/global/file/60631261423.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161118a6d6ffa8---dusuzewudakotanosa.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/jogebijedeferafo.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/tofaja.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/89427307535.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/mudap.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/41451360451.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/9506232495.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/wogofadi.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/99820426166.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/45156426773.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7874d4f12---95358679291.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607469261f4ff---kawiseresedemadesas.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210615235135_ui3t18.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/81706069771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=once+on+this+island+forever+yoursPDF 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_off00010d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AE 10876 bytes
SHA-256: e619623d2bdf6f57e01c1b694de6c336bfa938a15beef136d4410340eeafb0f3
font_02_sfnt_off00013ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED2 18680 bytes
SHA-256: 898150f3390590de8412971934dd19f5993a09d64266b86c4d18318e9d076a61

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