Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec391f157f2f5f67…

MALICIOUS

PDF

96.1 KB Created: 2021-09-04 10:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 646c5198fb6aa66ca68af84e141aaa02 SHA-1: 3301b3988c506f39aa760edc5ecbf2572bae2ee6 SHA-256: ec391f157f2f5f674aa4fded43edf71cc8bdc49fc2594cace2a925b4c04f055f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and link farm behavior align with techniques used to deliver malicious payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://grandchainfamilyfoundation.org/clients/85333/File/33723710430.pdf In PDF document text
    • http://www.majbrno.cz/uploads/files/vazokivadubogelo.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/d4debfb91444d271cf463ed60055727c/rapikowegiragekagafa.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/8b99e0bf731117dda037095ea8a06306/54391115407.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ijrucllmoegk4iams8t93nakc4/91734084596.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2c5129991---50298499974.pdfIn PDF document text
    • https://tavio.ru/files/file/77319026779.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/pajedulatalugis.pdfIn PDF document text
    • https://laser123.com/geektic/files/42082616369.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/b395fd2f3504455aab461ffda186536e/11062950415.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161045f6729e58---81783570528.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c663d421088---57482279784.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/kexizuf.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/qq8jfjgs9l36a54u18bf405tf8/dadipavigodanugudewifen.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/25005160836.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/49029074109.pdfIn PDF document text
    • http://patokapugsnkisses.com/clients/61143/File/25857926621.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a430d77b190---42220637075.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/resesukuzobetafu.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/65459529712.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/4ca311c95603fac1c2b2339e056878aa/86976895030.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f259bdbc51---duvukaj.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d29e3f045c4---46705404843.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/38963923801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pembuatan+tepung+ampas+tahu+pdfPDF 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_off000115b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B6 17012 bytes
SHA-256: 91d850edc1979de3ec225c734f15d60bf33492b44efa67db1dc930970179c7f8
font_01_sfnt_off0001424c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1424C 10828 bytes
SHA-256: f6fe18dcd686dd5887a170ca3dfaa40a252023f979b229eb46389dddd5545c17
font_02_sfnt_off00015ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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