Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc57757e14da4cff…

MALICIOUS

PDF

88.2 KB Created: 2021-09-01 09:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a159a3d804145ee1294db8605950cd5d SHA-1: 7c9de289630c09afdfe55dcc500f75a07d8d0c4f SHA-256: bc57757e14da4cff63991ddadcb88197dd7a36a75699cbbb8fe74e868793497f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • 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 http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e356cb6cd24---72411249692.pdf In PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160771b94e1f71---sewafede.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/8690999300.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/16ed83db5764c627c7a7febbc92f7822/xetolesome.pdfIn PDF document text
    • http://computerdoki.hu/user/file/vadonolidewiwigunomofiru.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/4g82seh4pdcg7ibognokrtjlrq/10900024872.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210608140250_5v0edj.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/vbb58coc7vm8ur9t55isf1mtm0/14088535211.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/62792729269.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3da26c92dfc5bc5d04c3024b457b16d0/18919836084.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210612_9406F0B4E3220C48.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/84999735643.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/81789312649.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/998ca4b44453bc1912208f0f5d167fe1/12925972451.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d527ee6676---fuwas.pdfIn PDF document text
    • http://silatur.com/js/ckfinder/userfiles/files/jogatudizesev.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872bceccc85---74440087161.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/20b1f2bb1b2c58990c0107e608c41540/51409768736.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/lexabajepelavogaxuxulinez.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/losegelafuda.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/deloxe.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128ff8bed606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=he+first+love+usPDF 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_off0000f495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 18232 bytes
SHA-256: b5bbccc9aa45f376c6732a721a25a6ca9aa50ad333aeb13c227f7207962b61cd
font_01_sfnt_off000123e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFC 10096 bytes
SHA-256: dd145cacd7a087e6c3d62a028019380c272b85c7a416fe064b3c3b16e3736232

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