Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c8428b41e2755c…

MALICIOUS

PDF

78.7 KB Created: 2021-06-28 17:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33c1548e7adf91de2ad611bda50ab89f SHA-1: 75b057c7beafc4cda36dd50ee89ee2ebfa3749fe SHA-256: c3c8428b41e2755c7b5b74a48923ae3be40a064528a2fdadf4bb9b5e7c4e95fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous embedded URLs that point to potentially compromised websites, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics indicates a deliberate attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://modero.vn/upload/files/jakoramesufobame.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/46uh7i1l0fsdc81gjvrnpksnue/jubofonatuvaposisid.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/2542a92605a2af2501bdd1e5058db8c5/9744491906.pdf
    • http://gat-asset.com/CKEdit/upload/files/90235695992.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160706ab24003c---soxarirupevaloxulap.pdf
    • https://m-astar.com/UserFiles/files/52097898809.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16089f73b2dd93---barowigeti.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/66d81c72b23f5d8db05233cd4a205d19/belorev.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/fdc6d4b6d3e91b17ecbd76e3d0683400/74521079470.pdf
    • http://nw-line.ru/generic/uploaded/zufofo.pdf
    • https://sjalikave.hu/pictures/file/49273378617.pdf
    • http://greenlivinggarden.com/htdocs/UserFiles/file/52022003998.pdf
    • http://amoy-art.com/Upload/file/25596992502.pdf
    • https://dolcezzecaffe.it/file/82485922649.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160966db1c00d4---25584116274.pdf
    • https://educhina.mn/editor/files/xokewuzowete.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/6d022a2a4e6c3fbc1a985f990d24dc73/44558095823.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748fd31009e---94919242546.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160779deeeffe2---12328462804.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cf66b6838---94748484511.pdf
    • http://congtyvima.com/images/Download/95222668441.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=sonic+the+hedgehog+faker
    • 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_off0000d291.bin
090ea792e8f2bb7218d53fd54595129f3e40725a14488766a36e542de3771c3f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD291 10708 bytes
font_01_sfnt_off0000eaeb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 16792 bytes
font_02_sfnt_off000102fd.bin
af63e3d94ba5033200ad30c1a6933703baf2f0e625087705fff59c3c9fa524d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 16628 bytes