Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f9f15c2e1e5d1d…

MALICIOUS

PDF

117.8 KB Created: 2021-07-22 16:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 08d4661a3f2bd5e74a024b6dffbbb0d2 SHA-1: 05246742683c59f0ea104edf4915f1aebaf2dea9 SHA-256: b9f9f15c2e1e5d1d08b27901e767dc195e089f9d2f94fade57ba933aaedbac01
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is unreadable, but the heuristic firings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16094d768ea091---xemebuvalunetabavekogu.pdf In PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/uj5oadv1ljg3e77d1chu2sg7s7/17334059849.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/bebf5112b587935c1b4b6e3b5d68a70d/pajibakabafaxologevuzoga.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/tijelarujixokikefoxepoluk.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/41005453316.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zejotinukexi.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160875aecaf1ec---63788996071.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5c2644432---74100792769.pdfIn PDF document text
    • https://cristalensi.com/public/File/ruxefux.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae07282e24d---13161720501.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2f45a9238---56971630123.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/17a56c9e8b150714299ad0d169d40b01/wudopivezetikofejuvuj.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210531_EAEEF5A61367881E.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/rivaxepomas.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210617_194801.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/a535ec5f20fc38b534844ab52e8bc376/53110991857.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edd471189f---69565974399.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/8a3aab5e670e37f042aa6046771d7523/65703543840.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/95460130191.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5798bbb2c1---getegenubogofujegegona.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac071b5078c---jumasedimonejizilemujuva.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab5a0727fb---kimunom.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5cbe5940e1---26054338559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=quadrilateral+with+4+unequal+sidesPDF 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_off00016390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BA2 19716 bytes
SHA-256: cc41ecf3839b99f8ba173f08f75349f68de131eaa7572dd1210657e5281b7094
font_02_sfnt_off0001b080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B080 10692 bytes
SHA-256: 118a873497b63e502a23e55d9ac5340bdb5098baf53caa0ee7d19e3a4a9e2a97

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