Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64c5047b528a44e…

MALICIOUS

PDF

91.4 KB Created: 2021-07-13 23:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5c6812dcdc75245f7ba71c3d2f987141 SHA-1: d1d3403d8c104b670fefe969379737d770c086f0 SHA-256: b64c5047b528a44ee1531816803f42ffa40d299ec4bfe5ae559f8407a9e05c63
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 functions as a link farm, containing numerous URLs pointing to compromised web hosting, likely to redirect users to malicious content or further stages of an attack. The presence of external URI heuristics and link farm indicators strongly suggests a phishing or malware distribution vector.

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://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d85e69d14e---nenutelojemi.pdf In PDF document text
    • https://erdemlerkoleji.com/resimler/files/73687182231.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/56816720041.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736b223eda2---39925339944.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/31424777805.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/dojoluzube.pdfIn PDF document text
    • http://artside.org/data/temp/file/15709020311.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/29703894480.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/37227803476.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/momakebanarowiralubi.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/48763966521.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/83725250423.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c05f772b37---rababe.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/birigewijira.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/datasawibibuwiripiso.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/1oialdedundn903sfud7r3vrv4/xevikafomisameluniruja.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/nuluganizowusigotari.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e8292276adb---nekuxosepebologuxigire.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d699b1a0b4c---mitazefalepadolemivaka.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084400d924ac---79486663203.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/0d7b26d974c4909960596a89105593e8/nesop.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/5e718838b4515e6ea793b38e4419cb0e/76499412852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=home+recording+for+musicians+for+dummies+pdfPDF 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_off0000fef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF4 10908 bytes
SHA-256: 69a96fafc1da51c5c234dc9d796ef9c86568a7a4e2295cf82b41f409357d01bf
font_01_sfnt_off000117e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E3 18516 bytes
SHA-256: 9a687d4667c66374d6493b88d7590a04b0255bed100ed470cb2d9badd2355c93
font_02_sfnt_off00014829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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