Malicious PDF — malware analysis report

Static analysis result for SHA-256 744e786654724196…

MALICIOUS

PDF

97.9 KB Created: 2021-07-05 07:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3b4be18775f2cdf91431267a1c6c6a1b SHA-1: 157a65f5878b448fe1ab0507efd98857ff23b8b7 SHA-256: 744e78665472419618f88a42bd9734e703537b761ab663200bd3ef0127f6df2a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and other disposable hosting sites, indicating a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests malicious intent. The primary function appears to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9716

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://simplehome.ro/ckfinder/userfiles/files/82705013593.pdf In PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/mikesitosemelalopen.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b247309b9---wijivegef.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/lalavesubesi.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/78617443574.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918952d2ba6---gitozo.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ia1f2l2a0huge9k5q5q39794bl/lametaves.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8604ba9d6b---11051725944.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210613213245.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ihlb4arkuabfrlqul4mqhpoi04/besutonixulogefarokup.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/832bc7b385968778fab9711c6679e94c/xikilugesibu.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/5381570495.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/dc353f02babb95eaecb394aaa8454960/76970651183.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/fp788e0ql08mm8mcnr70ptb1q4/vatefowinewukem.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/200fa750513d4d1731167f8f1962601b/53728385237.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/vozozepujot.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210628_224147_1957.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/bbfc72ae8560ea3ff6f6932a4c20642d/3772807758.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/liruzagovaji.pdfIn PDF document text
    • https://reniuved.it/file/65195951551.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d335f8693c---nanajibe.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/jodimata.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607713437ac50---30927315736.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/f9a0065d2c8b2deac872178f0b430dd5/girilafizogetazaxeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ghost+fighter+tagalog+episode+1PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF5 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
font_02_sfnt_off00012267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12267 10764 bytes
SHA-256: ce7a623375e78f0a6dcd47489960ab9c5372f632d0e8a01c706296016c2cf178
font_03_sfnt_off00013b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B29 19424 bytes
SHA-256: 67bf8263be837d88ec2567941174aa0ae96d0bb88f73f65c832d7a1d469be9cc
font_04_sfnt_off00016c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C6D 2668 bytes
SHA-256: 2b06f9d34c88cefe2431c8a964b3de48eb9d07bc92444fc0a82417b4c7d94dc1

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