Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e8caccf584750d…

MALICIOUS

PDF

88.9 KB Created: 2021-06-28 15:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 477c2e30a3cd4011db207a826b89e8d9 SHA-1: 8fddc44d46231d6dfeb7978a7f73ec26856552e5 SHA-256: a0e8caccf584750d4f574ada31bb4a96cc4ad0b56ae7b61d2d0bf7a7a516726c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a potential phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/0e8c39d311647700eb3dd24fe8aff03f/xagurawakub.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9a5058a6179544e648433b6c22596d45/46265815858.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609661ecdda89---tigefoduramejumiz.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/670e1010dbd10f113341b7370da13008/66683460668.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/adf546659d6680e9d2c92993fad2b2fe/xifizaruluzegamojaxewa.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe773aef0e---26576684413.pdf
    • https://hinodanang.com/uploads/image/files/99197442651.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb312517e4---76487934283.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b58fa4168---gunuverenodepiw.pdf
    • http://luatsubienhoa.com/upload/ck/files/femudebeg.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a2f70ec6---58721950836.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5aeb1df93842da60ca4e6d663ec7a81f/fuvavivimoval.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160861a6b37ba4---19817332058.pdf
    • https://heatingboiler.ca/fck_upload/file/serebizoregovijodoroba.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/3jf2caqhk8h3sek5d3jo7e6r63/13236308562.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/31768036294.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/6bacfe44d26b7d21854c24d8e8fc8ea9/pedadovibexoj.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775eb6c1444---niguvimixiga.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/0d2c475r1alt9vvq0uf87uf2ar/kojagaduf.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/aa7ad5ab359c51adb627b6cee4ebdd15/50668703150.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/620d0aa5372ef2905268788ef7b18456/94591200823.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b60cd3aca---kubirefajuzawubi.pdf
    • http://adria-ex.com/images/blog//file/folopapamiwofarodarul.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=periodic+table+of+elements+with+molar+mass
    • 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_off0000f76d.bin
f9343cd874ac0a21eed870f97afa3805577526890812b7f75c0dd1f6ac9337c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 17336 bytes
font_01_sfnt_off000124c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124C7 16792 bytes
font_02_sfnt_off00013cde.bin
d2bda7ab72b2d2464b851b018f824b85c7c6efae7b11a9ad483e6a886e208431		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDE 10968 bytes

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