Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd96bcb33b10726…

MALICIOUS

PDF

86.1 KB Created: 2021-06-30 21:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: dff433d05c9f49e850341f5092a7b7a7 SHA-1: d2846249a89c80fefe3d4f35bd5467506a735725 SHA-256: fcd96bcb33b10726968affc4ced8b8b004adafb30c496f3ac7129909d589b4e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of multiple link farms on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160803ed361634---1475012372.pdf In PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/65517134000.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/e61c462fc806eb8b89d7fa5bdba7ea1b/jujew.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/2712b334fbf02a5c99f72c091c4b1258/93281945156.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d27625575c---44486097587.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/12270460073.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/jltigjs1o0oetmrk7rvbmgk19e/58159612345.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/pfutsg1g9sr7b5amie6oj28230/jurumuf.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/c052ee12a281f438c0644c10b9269a44/mebimakopiletepuvomagif.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717e118e1ee---71965732766.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2160c1ed9---bomanegopowimesisefan.pdfIn PDF document text
    • http://toyotalongbien.org/data/dulieu/files/62290441634.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/fad13c3966190653c559d1b0ab063f1b/nibililemufagewiroki.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/58cf85055e00fec2bc26e10e91118c23/takin.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/pewisonodevugutomotab.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/xojizur.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/57528066456.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/8s37mmljf4polb1en994hv1j5o/fofedodejenebefunifipu.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/8698aa629486967202156777b5b590d7/jiladovedufinipow.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/dmru1up8mamh42tr6vdpmatjrk/94215626962.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/2f3db9f4b5802f593a0b22092bdd85d4/misujodopowawiginifisij.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/78566001186.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/62939975023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=easy+duet+piano+songsPDF 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_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 10616 bytes
SHA-256: b91ff82e7f9da2a716289c6e267c575ca7ddd75b26bd701aa8776d0100bb7c50
font_01_sfnt_off0001053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 17692 bytes
SHA-256: 936834b554e708fb600678a68fa1c150bfcfc71ea1dab67ee08571dbb4b4330a
font_02_sfnt_off0001338d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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