Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cae7e2fd1ca17b8…

MALICIOUS

PDF

83.3 KB Created: 2021-07-06 01:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfe88d4e5c38155060ddc8edfde3f1f1 SHA-1: 6c8052cade6fbf4c8a10c172af63549b8d5c89df SHA-256: 6cae7e2fd1ca17b8c8e037ed93ce2b2daca3051ac931921a1860dde10e6d2c2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=the+brow+architect
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/0a47b02a971711000aa6b923047c3b3c/gavaji.pdf
    • http://moriefrusca.com/userfiles/files/57265619464.pdf
    • https://trunglamdecor.com/uploads/userfiles/file/53766041254.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a618ee3321c---sopatora.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a362a27752---berigasenexivexaragel.pdf
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/16417762667.pdf
    • http://xn--42c1dhzaq5aeb.com/userfiles/files/nejezo.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/00b3b3cdd07fb25ccc3e3ecf3dafed3c/22232343714.pdf
    • http://citra.cl/userfiles/file/tikotebu.pdf
    • http://sl-light.ru/design/img/upload/file/gunif.pdf
    • http://baovephuongtroi.com/vietkiendo/upload/file/9847632483.pdf
    • http://uhli-janmaria.cz/userfiles/file/kukariwewowujejelarezusel.pdf
    • http://koryosushi.com/uploads/files/9130950716.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/9a2e720ea04fd059aed292d4967e00bb/73642991476.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/9f5db7dc009fa086e6f49ec7ab39ad26/jexebabakizinap.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/adkfn5342ff9736acn4pfi55i2/lavekit.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cdce5922452---71897345302.pdf
    • http://thsport.dk/ckfinder/userfiles/files/55071042419.pdf
    • http://scuderia512.com/js/upload/files/69501349819.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/2f5b05f83109674909b544fd6ce315ec/pafowekidesakezenuziz.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609497168ee3f---91570810202.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/cdc43c7b634bfa400301c46335938942/vorakogirusijabesomiriwo.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d7f5f3771---morobol.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/fe20cfbe61f6f1c8c0f0a5f17f915d6c/wuwudis.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e307.bin
72d5df6fe53332d5034b77e53017721cf8f2b518c63786339d601f257441fc37
pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 10196 bytes
font_01_sfnt_off0000fa1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1C 16792 bytes
font_02_sfnt_off0001122e.bin
d561c9137c1a271d513b7b1035cf41c892387a5a0c10ff21dbfa49c93a8fb0bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1122E 17496 bytes