Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ed6579224c909a…

MALICIOUS

PDF

82.3 KB Created: 2021-08-18 02:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a347b9e935ea56b38d6f0435af7dc08 SHA-1: 5573862a438ac650f1fa8aa923164c4ee508d360 SHA-256: c3ed6579224c909aa88e1bb7bbe9ff855cb11a1a724e269bd666729b787bef62
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, specifically as a phishing or trojan delivery mechanism. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the ultimate destination. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://akapacha.com/userfiles/file/86993778635.pdf In PDF document text
    • http://cioccolatogallucci.it/userfiles/file/22180556453.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9edb680647---sitokomimisovotipiget.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/nopisupojomibusesidifon.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/65024feea9ae8ea460639a1a28fe93d7/75628186826.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88ab0a6631---98948502271.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d9f31295b---tidakomab.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/241a0dcfacb4cee542775e660489c2c7/93570306873.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/32464909059.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/bevudur.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/kamaz.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/wetotigodiserufedeluwusu.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160beddec25209---32191984265.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/skogpah0g76rvk70bruv0pvoi0/89749612894.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/tuxodomugonuru.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/wenep.pdfIn PDF document text
    • http://blueyee.com/upload/file/040028366487.pdfIn PDF document text
    • http://voijin.com/userfiles/files/sujodanurigirezebibe.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b4edd9275---35726548964.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2d757e14---5779868483.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/31938161471.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d1a69b526---xofoxapadomowasojunupip.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/01f9fa82dff34865b40ba5eb0cceaa43/80267976573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=my+papa%27s+waltz+poem+analysisPDF link annotation
    • https://mediaget.com/userfiles/files/zifulejewipovitubatowonun.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_off0000de49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE49 16624 bytes
SHA-256: d96c00e83e4a653b48df22d8edc58475468fceb16377d9f329020c4e657b49f4
font_01_sfnt_off00010922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12139 10600 bytes
SHA-256: 2145fd510ee96bbaf3f5de9f0004756f8edce28944bbc84c65f26b32711bc9e7