Malicious PDF — malware analysis report

Static analysis result for SHA-256 d26fc9bc5aae5b79…

MALICIOUS

PDF

73.8 KB Created: 2021-07-05 18:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80e27d00c09f20c43e9d4b1a1c5758a7 SHA-1: d34f7017400f61e869a3f4c9aa63a797d26b70cf SHA-256: d26fc9bc5aae5b7957bf2e38f024cf29e858bd7b4e985b8a8bb80765edf391a9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into downloading further malware or falling victim to phishing schemes. The presence of multiple links on disposable hosting and compromised CMS uploads indicates a deliberate effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f76790368588854cb69a9b8dafde52a9/4717408580.pdf
    • http://kimhoatra.vn/upload/fckimagesfile/gawidopababepaboxo.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/609f39974acaa5094acfc0781d4085c8/pazepijarogosumixewi.pdf
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210612171121.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/ec68fcea11992c40cd1f294c29d9625f/jowuxapimodu.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d999e5b671---luwox.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a52286df3b9---99745540135.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa2af11130---1957552476.pdf
    • https://delaneyllc.com/ckfinder/userfiles/files/55368414475.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/528a7c04038aeffd15ee8e72fb89e309/taxoxemuragenisobekasebuk.pdf
    • http://lukasikgroup.pl/Image/files/1799917167.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/33645678817.pdf
    • http://iberia-ex.com/images/blog//file/80538448767.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/emhkfmtg4q2r6jdldcolf8kal3/83394801768.pdf
    • http://dominopark.pl/public/upload/ckfinder//userfiles/files/24599200198.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a07be15aeb9---fowukusamexapajaw.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b12c1587c645bc5586926a1d99fd4616/76925628215.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a04b7a936---31064719356.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/3cef6b611428244bdde631321415afa7/vitukoxefenopus.pdf
    • https://bluetact.com/locktactyuma/userfiles/file/tulimasufikiwofinofub.pdf
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/zixanovikerabeloxiwegu.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/37c6far2f6m5edbqop67kbrhcr/ketegudukarabuxerixima.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78f5e24018---vuzexozeralu.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095941d8f9db---35043361518.pdf
    • http://3q1p.com/upload/file/210701094324539938z7nhtk4ghdh6.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=knex+tow+truck+instructions
    • 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_off0000bfd2.bin
6fea8b79cacf2e889e51734c02ee0462d88cd8ac572f7bce76d03182ae00e79e
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD2 10384 bytes
font_01_sfnt_off0000d792.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD792 16792 bytes
font_02_sfnt_off0000efa4.bin
d9cc1499ed4122594299a0d2d3c1f255740e57351d7f5af2c9f21af23b1e9f45
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA4 16604 bytes