Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7a62f3220e3c09…

MALICIOUS

PDF

99.3 KB Created: 2021-07-08 05:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40656d59652942a9e590aa2627675ea1 SHA-1: c28aca6da197d3bc78e8c0dcf558e00ac5d735a6 SHA-256: 2f7a62f3220e3c0992eb4b30f08ae319290d7160be8267b2767296e1cc833b56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious content. The presence of multiple unknown URLs hosted on potentially disposable domains reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d544838b6---laduxoginatibed.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/c24ec37b68d6b0a0e4afcc1f34247fb3/vitufegenegagazadukozu.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/al43vo6j744lbtp5ahvtdjl737/76828519252.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad65feaf9f---sudadafoxeriladowizezi.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/sezogimepezo.pdf
    • http://andrelandberg.com/userfiles/file/39061486093.pdf
    • http://vipnjl.com/userfiles/files/fidikijosoj.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85f16599dc---dixotarakizodu.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dea378c8e5---45146078762.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/384g4imnh9rc6v0o0fu4ku7upf/15883301694.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/e8qdqki8q3s89dmg5884ivkjt1/61768867674.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/bdec2260e525a7eb7fbd9cf12399dc78/koveriwewowuwuwun.pdf
    • https://eurouniversal.eu/ckfinder/userfiles/files/zajeboti.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160806ccc40a2c---2922969154.pdf
    • http://citra.cl/userfiles/file/56979539520.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086bb1173c48---votufe.pdf
    • http://airconbank.com/upload/fckeditor/file/vowaxupepitigaru.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3e30bc07142b04e6821c324976c06059/94292029761.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/da65ede4c251323ec76570151e7b4aaa/47692538415.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/88548999af991815ee3bd1bd0415e9b3/40540225341.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9acbc386---61091814526.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d643110b38---29643563010.pdf
    • http://hum-lucknow.org/test/fckeditor/file/navatapumewurerotigilap.pdf
    • http://bike-aholic.com/UserFiles/file/26189395970.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b606ccd093491d33529c3c7abff99045/39759465538.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=overeaters+anonymous+food+plan+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fad.bin
5ce1f6dddeba6aaab715da3eef42ba9f01174c70269281fa4ca654ee73a955e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAD 10872 bytes
font_01_sfnt_off000138e1.bin
a78e2742b370e1a52ea4c34326c2ece085746adc701cf07a7d6c3ce477b1ab86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138E1 17872 bytes
font_02_sfnt_off000167a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x167A3 16792 bytes

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