Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cea7b08239dcdf7…

MALICIOUS

PDF

381.9 KB Created: 2021-07-02 22:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4367d007e1167a5889dbbb1834c1590a SHA-1: db1ed0c369eb0e44cc9dd827ef27141a9c5494ad SHA-256: 8cea7b08239dcdf70ef3dda01a263df869bede2663c7082217a9e9e69552980c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to compromised WordPress sites, disguised as a free download for a technical book. This pattern is indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious verdict, and the embedded URLs suggest the document is intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9287

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://catamma.ru/uplcv?utm_term=web+development+with+node+and+express+2nd+edition+pdf PDF link annotation
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607859bc4ffe1---46593798716.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/344df439af92205381621f20428387a6/lobufalavegapebugosob.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba30e9d7dec---37807687379.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609af56d36a29---jesabegaxakeso.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/vasenofute.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bb351bcd7---5189300638.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/dedurutopukuborujumivol.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/528e52ab84dadc6ff63cd402680b99b0/fiwafurakatajitojaramo.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16083d00397596---30262430787.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bf1e55396---85933725556.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3966a4706---20512876565.pdfIn PDF document text
    • https://fallsplat.se/file/25442112633.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e213e2368---11324081423.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/83164889210.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6b595d05d---1445400800.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/matelitefavegorotiwelu.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430142841541441.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16203199995531.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a646793d3---65058434264.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/30f35238d98b5cab2486c0a6cc891539/tufojuve.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/tipazivefinesisenilofowe.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/65579882888.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/556vrllueci708rdtnfu6vb4f6/67447857892.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0005c606.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5C606 20136 bytes
SHA-256: 5760eb3ff77b0892883cbb45d64554c0c1b30c370a582b37aad5b18d78c42b48
font_00_sfnt_off00033aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33AA5 11272 bytes
SHA-256: d045743a69362fe57be05dcbb914b5d21bc232cc3d4d673ccfb87f597e8d8099
font_01_sfnt_off000354c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x354C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00036cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36CD4 33288 bytes
SHA-256: 2ea52ff0f485d866615232568df130c36bc414f80c66b7342809fd4acee2af8f
font_03_sfnt_off0003b7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B7E2 215052 bytes
SHA-256: 48a0931189be02177e51df68f2c63e7278e32b7c66dba4d98480bb9ed73dfd4b

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