Malicious PDF — malware analysis report

Static analysis result for SHA-256 d211f7bf9030b850…

MALICIOUS

PDF

89.4 KB Created: 2021-07-23 18:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 625a2bedc4d7b9cd1ea6de3b5bf4048b SHA-1: 9039014ac8eb0f05bce690edc53fdb142ddc50bc SHA-256: d211f7bf9030b850723a7913868162a8d30f25a87c33a157e274b65838df2267
164 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms or disposable hosting. The presence of a download button lure further suggests a malicious intent to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/c061ac42f0a5162a9a358fa396335373/soxal.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b226e79c3---13236088825.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810da23ee07---48990598599.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4c8496991---bawiziwobofanivoxeriz.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a0b34b182da26ccf6cac82d7335a93ed/wasemiwonopatisexodiga.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a861d26cd---gexopikamozipaz.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/tfc0l89o7h19b94ttf0916olfn/24632193762.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c6634187864---bomevedadibikijutakiminu.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/c8f8029cf3de233bf99f837120ab9c02/susewamizum.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/51e226c6c87cda453c166ff1b6313977/52772027861.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16078b6e209295---kabujowosebipu.pdf
    • http://4998horo.gmmwireless.com/contents/files/15404673882.pdf
    • http://aclamerica.com/customers/CMS-IMAGES/file/93936570107.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/58df0a6c2e796deb72d835901332cfc4/53083263099.pdf
    • http://limuzine.md/userfiles/file/29986160219.pdf
    • http://brmxn.com/userfiles/file/20210614072718_5erhji.pdf
    • http://say-international.eu/userfiles/file/46410003822.pdf
    • https://manajrgvaaradhi.com/cms-uploads/files/lubuvomezasijotenapato.pdf
    • https://alakharia.com/public_html/userfiles/file/lelun.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cc135ac67---41896891477.pdf
    • https://pindimana.in/uploads/file/fejenagi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=camscanner+premium+apk+2019+free+download
    • 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_off0000f65a.bin
a61790f7f55e2dbd43f3856a09027cc33a49dcfc867095218a9eb1843b84afa1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 11452 bytes
font_01_sfnt_off0001117c.bin
70aa4f178cbbaaa6fd0ee838f6cdbabcd5b258a2e41dcfcdde358f08613ee5ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x1117C 17260 bytes
font_02_sfnt_off00013eca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECA 16792 bytes