Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd368af65cbb3d72…

MALICIOUS

PDF

123.3 KB Created: 2021-07-04 04:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2399b4dd470c35ba762d54bc6158a04 SHA-1: e9d3de2de9a66859da03dcd8a005d8f5627405c2 SHA-256: fd368af65cbb3d72e7b4a7fbe8614e3ea162ba45fa07ca4134d39517acfde459
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. No scripts were extracted, but the structure and URL patterns are consistent with a PDF-based redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/cb2ac3b2a549618d222533f59f122ede/nujogelupojebutosak.pdf
    • https://areicon.com/images/file/94611363661.pdf
    • http://inwallendorf.de/userfiles/file/goditiwajopalexefazikajur.pdf
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/jejelupenetunaredotuzoli.pdf
    • http://agiusfuneraldirectors.com/files/file/72733238256.pdf
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/runub.pdf
    • http://skiflogistics.ru/userfiles/file/34422988985.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/2b730482c2ab27642f5777e8e83d10dc/danukikarelexefilamewijal.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086c23456e2b---39578046715.pdf
    • http://kokalietudarbnica.lv/files/files/rutokejomilukobakilunejig.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/096e9c69038e98e07f7b134be396d332/57695268.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074930ea3af7---tapemotutorokexizeli.pdf
    • http://ilyxrace.com/userfiles/files/34603422774.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/mfggr14onsj1jru2aobduqchen/pozotapupikoxugunozil.pdf
    • http://mjsolankifoundation.com/fck/imagesfile/jenuraziposigonebadikine.pdf
    • http://hyundaiokla.com/uploads/files/tigajeganosigekejipuzubad.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/0c4b992f57c91f689f4ddbfea4288c0a/mufusezab.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/7364ca45a9f1ab13682909a750257afc/47455816524.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af9dce95a5---82416951046.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/8ffbe59c1b81ce943397225c9fe1a72a/40500718436.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d49aa63fe---65701769116.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/11158483338.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080507583db1---69341861291.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/d5411efcd958bcc225c34094b94fa92c/39541021873.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608631b3130e5---98736534921.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=gifts+of+the+holy+ghost+kjv
    • 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_off0001848b.bin
3a755dac04accc21dffac9f442acabccc62d737ffbecc21f5af86c7381cf183a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1848B 10568 bytes
font_01_sfnt_off00019cdb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19CDB 16792 bytes
font_02_sfnt_off0001b4ed.bin
393f9179c32cbb1ccc116604ea2973b287a37183ca73e0161c18279882d5c08e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4ED 16556 bytes