Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd3d54484f57a1c…

MALICIOUS

PDF

85.4 KB Created: 2021-06-30 00:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f6871515fb27cd12f4163a0bc998414e SHA-1: 45ec19b4e64a3c3507dfc5dc71b0ec77e6b22426 SHA-256: 5dd3d54484f57a1c331e7ca2f3cd727df9116dcb0e99cfd697825f165cda85a9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no clear textual lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://lamorenj.com/userfiles/files/71792272802.pdf In PDF document text
    • https://audit-advisers.com/userfiles/file/nuduguwu.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160d84df3e6374---61837076067.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/87353045847.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/57139003968.pdfIn PDF document text
    • https://peterdegendt.be/file/kumokelizimedetor.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7ffdf0f86fd239569e0feb580261f5c9/fobulo.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/bobasafigipuzavut.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/3fcgpmff9pfgi2e8npf2f17aev/37950231826.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a32a00194d---92164201478.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d323529ba2---51373906673.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609269447a77d---19106394945.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79ed259b55---82205393451.pdfIn PDF document text
    • https://rm-parketi.si/uploads/sakemafepalowiwel.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/87027f01045a3a7c49f1e3cd494243e7/22265251064.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/12675975524.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/91966608015.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/12f350ef982fdc1dc457d58856cc5fd6/68147555401.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/fafibole.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/a10f81f5da9933fb21057fc460aad1f8/53182433531.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608869f6e7a56---bosugusokaramigiv.pdfIn PDF document text
    • http://klpa.net/userData/board/file/81242443181.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b3c604f1b---girakamuxoxibolita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=terms+of+endearment+tagalogPDF 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_off0000eb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001037b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 10568 bytes
SHA-256: ad9a055d12b710190a438b20893c6937c0b88d4673502248b37308532738d342
font_02_sfnt_off00011b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B64 17396 bytes
SHA-256: 5d78c8ab4061792d78c12853f4a61e8133fa7a1981f66212d1b4b74546a2df12

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