Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fee704e035ab531…

MALICIOUS

PDF

84.2 KB Created: 2021-10-04 22:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f4afe7280bd3905c0e3a51765ed1749b SHA-1: 3ed597df3d4875add850d602d73c06e4e5d8ab1c SHA-256: 8fee704e035ab531932dec20e140f0c0b8798f2f89a8d2ee967fd7e6a81fe4d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS uploads, further suggests an attempt to distribute malicious content or phish users. The embedded URLs and the link farm structure are the primary indicators of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=epigastric+pain+treatment+at+home PDF link annotation
    • http://stepasidemedical.com/images/uploads/file/98036532680.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb34f31820---43176271747.pdfIn PDF document text
    • http://telecycling.org/files/file/33455821000.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/bojodogedidot.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/5021490971.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f30de245ef9307231054ec4ce66eeb9c/49879891568.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/88941913316.pdfIn PDF document text
    • https://12shio1.com/contents/files/wonugagovezarinoberetijak.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/88128635773.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16130733d32f4e---51160471501.pdfIn PDF document text
    • http://www.memoriahistoricamalaga.org/ckfinder/userfiles/files/zipoxebule.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210917151333_523140421.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/fuzedemopo.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/vomepodar.pdfIn PDF document text
    • https://reha.bg/content/upload/file/73517963610.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6a02400e7---91985600073.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/71192440086.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/7726981968.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210917/16318544973378.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/pibud.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/buvexe.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a9f8ecf0c87712cb098be53d6eec6625/23880233544.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/35526223367.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_off0000e29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 18624 bytes
SHA-256: 8336006103bc6e678c7f5ec50bf4812ddc31e6105cb512d4f63d291177dc0e41
font_02_sfnt_off00012a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3E 10760 bytes
SHA-256: aba4b622d74cca46cd0d059cf6f932699c51e3851fd6b3b4179fd84581afe8ba

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