Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b3bdb8e7b02541…

MALICIOUS

PDF

99.6 KB Created: 2021-07-13 21:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 62070830e535447c6ab0712c7c0c3c19 SHA-1: b1b35373fbf9349333a4e001088786acb9ae6251 SHA-256: 91b3bdb8e7b025413efb893a63921ceb1eb6e2b674789ad19459b7e4aacb2093
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to other PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV heuristic strongly indicate malicious intent, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the nature of the links and the detection results point towards a phishing or malware distribution vector, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://ibb-online.ru/f/file/kasasedidaz.pdf In PDF document text
    • http://www.zywawiara.pl/pliki/12157800219.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/89359908441.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/gaxasawububebadegubuk.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/53292762479.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/27c4f76e0147c8240a84dc0589cb447a/25179538234.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/jagegexeposikovesur.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/61123333313.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609aece781546---fukasonegofeliwarugemi.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d45b1158c43e4e0e27454bf5ed83cea/40145552550.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f539800018---45727404448.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/pajizivubosibavozamizuvu.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/63154056757.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d75b1135736---xolelavule.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/08lfh18ama9j81qm2mgfj64n7l/58521840878.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0966043156---lufubud.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/87f0659a759ce853ebf3a5cb0543eb54/42532556662.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/t954hottsssaav9ft3t4ojh77j/44860029386.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/minesobaranedimif.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa65085609b---tarunagajolonesakogid.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/69070772778.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/16551289920.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a86152b76bb---53914388186.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8f346c37---51477924913.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879c361a456---59219795464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+test+triac+using+analog+multimeterPDF 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_off000124ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EC 10748 bytes
SHA-256: 711c8f11ac4e44911722ef0ebb64a2b1e673983615543155835d37769f60e491
font_01_sfnt_off00013daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAF 16628 bytes
SHA-256: e71a1658e7911eab56ddece2877199104c5d41ef864d147b05b73f0c26fa6f84
font_02_sfnt_off000168f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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