Malicious PDF — malware analysis report

Static analysis result for SHA-256 3128b4556f6bc622…

MALICIOUS

PDF

95.5 KB Created: 2021-07-26 11:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 298cb324d6e3bd1f00e950e0aa0750f8 SHA-1: 4b8202796dc1a4ba7111790669dd1a77c4687b77 SHA-256: 3128b4556f6bc6229905ae486e73ff78b18bccd3a5094c8eac039850e57c2ff3
156 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. It contains numerous links to external resources, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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.
  • 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://changrung.com/ckfinder/userfiles/files/naxobajugufofanufus.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/3q0vq4sr1qghk52so9g88bcki2/75163770634.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b84620ab17d---84562839281.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/fc17db2e513ca1c90eb7911f55be17a3/zisujorubopudotomovinutim.pdf
    • http://szao-spb.ru/images/news/file/mofuwap.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092c03cb4cc7---bofoxobiwixemukewo.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16097a104b25c6---71589657959.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/cc236bc127777aec60b49d69263d7ce0/jesanimerazujipowikunuj.pdf
    • http://bobmeetin.com/media/galleries/files/46310441184.pdf
    • https://picinterior.com/ckfinder/userfiles/files/zaxebofewujamuti.pdf
    • http://brukikostka.pl/uploads/page/file/77256463985.pdf
    • http://ketoanaca.com/uploads/image/files/gugidukowosodozofafosalo.pdf
    • https://landbondcorten.com/attachment/file/84b93e12d1cd19715fdc6ecf15ce1cc3.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/esujnun923l6pgfi68edqt8pfk/40878559617.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b67939ada9---komekegiguvasoj.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/ee58a38f08bf740beb15f0a6a7fbdae1/goxejedakumaneme.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16081ef6eed4c9---xilurowoxuteromasejam.pdf
    • http://cisseo.net/userfiles/files/13065670804.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7c8d09002---nuxaliv.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfe0222580---1366707825.pdf
    • http://ssaisarang.com/ckfinder/userfiles/files/nobafonevovudezazolurir.pdf
    • https://szaniterplaza.hu/ckfinder/userfiles/files/gisuvogipotexiw.pdf
    • https://www.seblocation.com/ckfinder/userfiles/files/83492743398.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=hands-on+machine+learning+with+scikit-learn+keras+and+tensorflow+2nd+edition+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010201.bin
81e0e5d984e39924ed2c8a8076f4e96306e13e15b0cff076a17319663a9f02ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10201 18892 bytes
font_01_sfnt_off00013364.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13364 16792 bytes
font_02_sfnt_off00014b71.bin
769cca2e52d17db50c0d559d9a3e1c693cb5cca6d36cd224ce99cb71cf834137		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B71 1868 bytes
font_03_sfnt_off00015440.bin
4d080d356e5ebd7f8f84303ab3a3cc47b98d244e4c695f9b9f0e2f7909930358		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15440 11248 bytes

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