Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2430823398833a0…

MALICIOUS

PDF

81.5 KB Created: 2021-06-29 14:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9afac0b93724e77bda32cae874c143c3 SHA-1: fbf7a9dc6d9d96e2c7e9054bcba78ce9874f0e28 SHA-256: e2430823398833a0b27ae8e95847582199014afd9fbfe2bec9c57fab92388aad
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories. These links likely serve as lures for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092201f495c6---38109100951.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795c69c2655---58155311867.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962db807be2---lefidobefulukuvoraba.pdf
    • http://unesco-mediain.cz/fckfiles/file/mamodanopep.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1dae7976d---dabixegufewotexe.pdf
    • http://nhhs78.org/clients/63854/File/84456398616.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c65fe85bcf---jugixebewudazudupigusuv.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16077e841a8974---gewamekajanabagivepaw.pdf
    • http://archi1919.com/smlclub-files/file/61102802298.pdf
    • https://heritagecambodiatravel.com/userfiles/file/92422553942.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098727fcd804---53354507620.pdf
    • https://bdaudit.ro/userfiles/file/72113696857.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/6e65ae1c9747e76c39071283603fddfb/8629272383.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/48qpqn5u4f6rc65h263rsghs0t/82801379465.pdf
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/a2gdclv6fa40atkdsptvvv9l12/zedusejodepujulew.pdf
    • http://mevlanaasm.com/resimler/files/20589251201.pdf
    • http://artecgroupservices.com/imagenes/file/teragapafex.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/00fe4a989a0dab1bcfbe994a6fcb79e4/72346510054.pdf
    • http://sapaelitehotel.com/webroot/img/files/5007739555.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/nuline.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=meaning+of+tickled+in+english
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c249.bin
18358e951e5d6c069b09089149939c6e252c796e274f17bf1deca6c2b7646bed
pdf-font-stream PDF embedded font (sfnt) at offset 0xC249 10740 bytes
font_01_sfnt_off0000dab1.bin
27381d5aa4c8f64a6395754125dc9c010bda7c83bf858175cc377be0c921ad24
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB1 17984 bytes
font_02_sfnt_off000109d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109D6 16792 bytes
font_03_sfnt_off000121e7.bin
8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825
pdf-font-stream PDF embedded font (sfnt) at offset 0x121E7 16060 bytes