Malicious PDF — malware analysis report

Static analysis result for SHA-256 3750aa3d2cacff0c…

MALICIOUS

PDF

92.4 KB Created: 2021-06-29 12:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 914a82569ac16c7b47c854824ab0db42 SHA-1: 79b761d5647349ca452c99ff86627c9709ceb0f2 SHA-256: 3750aa3d2cacff0c25cf8af8d3806d5dd31e90cf076115dc9294d960cc0dc9d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608301c90f0c7---japupazoror.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/1cb0c554da13d1b058457770a4408b52/valinanutajefemurenilom.pdf
    • http://nedirajtebosnu.net/userfiles/file/28886293355.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b54ebbce23---66328275406.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/92e9e5f41dc759aa21e7e8ee130d9b7b/zovukifujokojodigixe.pdf
    • https://argumentua.com/i/file/vasolala.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/fraroi07plrkn8basfegk59p8s/66013213410.pdf
    • http://residencecarlofelice.com/userfiles/files/19596798532.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b09a7127b4---wonufirizoxosudarujezek.pdf
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/48149588844.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/cc122ba77cd3e948310d3b6ac6c971ef/48227129746.pdf
    • http://mpu-beratung-brendle.de/userfiles/file/pimivi.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/t0bp24cbafcn2ia906kgs1j444/vibap.pdf
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/bilas.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4840adeaa7e827b48f6a6eec5328ccff/padefabidiradurufisofigag.pdf
    • https://veaodaibrahma.com/uploads/image/files/vevejejirodi.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0c518e4e7---98824289707.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841dd877f89---xasamazebuvumuniner.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/b42ba233468efa6c3f1359d00600890c/42753966550.pdf
    • http://ceomit.com/fckupload/file/46563597802.pdf
    • http://auto-spec.ca/fck/file/punegigan.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/sfgi2vkosncfgnoe3sgmn27sog/lejitelotuzapexiwogep.pdf
    • https://malabarmail.com/ckfinder/userfiles/files/47511640260.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=bdo+how+to+get+silver
    • 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_off00010661.bin
e16e6e5da1e1e19860ad50015a41442b29bdeaf1cb56307a8c6c37d787a84701
pdf-font-stream PDF embedded font (sfnt) at offset 0x10661 10464 bytes
font_01_sfnt_off00011e29.bin
c4160dd959731d0f25b9703db2f7fc7c4563deb8259bd95e3d14a2dd02772f43
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E29 17996 bytes
font_02_sfnt_off00014ca8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA8 16792 bytes