Malicious PDF — malware analysis report

Static analysis result for SHA-256 96cd921bb21af7ff…

MALICIOUS

PDF

73.7 KB Created: 2021-09-06 11:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15339791d69899d91bca1248d03414db SHA-1: d28241921f936e292f64d9b24010b9c17a18c7ec SHA-256: 96cd921bb21af7fffa4f58340dad668895939f0feaeaa81d9cdc49669fc44787
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/3d9da089069d0b477a29bd4079adb6e3/29269268652.pdf In PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7ad49efac---72410216107.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/14593116451.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/sipemiruze.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c01704a806---14424511645.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/96230748690.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a02752cdc---30910443808.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/12351371455.pdfIn PDF document text
    • http://serting.eu/userfiles/files/kopigoz.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/zepivejolage.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcfe0c8a7b---66907155808.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/93197461549.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/volaged.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210808175301_b5n2p9.pdfIn PDF document text
    • https://xn--80afc2apd5n.xn--j1amh/upload/files/23900739982.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/60625669165.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/guroleworizon.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/30210549916.pdfIn PDF document text
    • https://majubesar.info/contents/files/waradiduxe.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/n94u39riv7nnoba9vgf85mltod/58726952230.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/35146604735.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/zozitanofawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=10.4+fission+and+fusion+worksheet+answer+keyPDF 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_off0000ba2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2A 17356 bytes
SHA-256: 9bed3236057ad895a22bf791b304b7d9a2596f898c2230baad48de19e5f90199
font_01_sfnt_off0000e736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE736 11016 bytes
SHA-256: 64fbcfbc5d56ed26479dfc4f05f13b1ce2d6183129e0b539b0178727037832ca
font_02_sfnt_off000100e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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