Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd77d2ae28a3492…

MALICIOUS

PDF

74.4 KB Created: 2021-08-02 21:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3298d4b8832e58a4f4cff8e66f2ad2fa SHA-1: 19212d8578200249cbcec5bad357c46745245792 SHA-256: 7dd77d2ae28a3492277b98d5145249e822676fca49c5d88f7d3d6dc2134d62c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF, as indicated by ML classification and ClamAV detection. It contains numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI links and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://allytemp.ru/uplcv?utm_term=resumo+de+direito+constitucional+descomplicado+pdf+download PDF link annotation
    • https://glycocalyx.nl/userfiles/image/file/wexamuxazapodewaja.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/72666824539.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mu0s1e7uudv8rau2fh3j3mkr1i/bogaw.pdfIn PDF document text
    • https://rintrans.com/files/84195699907.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/t99g2f2knpmeqihsqt0se4a3j4/89529635282.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731fe70c6ff---77151780387.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160702e8ac56ba---famibosesikubekux.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/5n6gjre7i2eg6mgi5h5qmoim31/busopupa.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/97489497058.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/625ca9a583bd0dc816043ef85cf3a785/fibetitajugidisazusimoka.pdfIn PDF document text
    • http://araonline.hu/uploads/file/vegax.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/96393390629.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609842db2bf95---zobegawupetolatafitotubo.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/gujema.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/82ts73716na9eungc718dalfr1/xaviwajovisinidav.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/sogopovilazap.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/o0um0k3gqbphkov789rnjqf3fm/zuzajub.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba355da06---zurotesewawisirevozeso.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf83d4740b---jimogekifuwob.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/78365393837.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/podekomezujadur.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc33ddfaed---55919776057.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_off0000bd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD71 18080 bytes
SHA-256: ce4c7a12d8debbbfd0fcdf8fa528c39f8743817080fb7f907b609b8f1b9b6acb
font_01_sfnt_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 11012 bytes
SHA-256: a85701bd9f5df14f98abce9bb8d59bb83db55e808cd6d453e238d160e904dc02

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