Malicious PDF — malware analysis report

Static analysis result for SHA-256 979541de7b123267…

MALICIOUS

PDF

76.1 KB Created: 2021-06-30 22:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b5e284421a24d55196a5816096427b25 SHA-1: fa050a5d6ca940da3d97a11a4465d1d5c1bbdc9e SHA-256: 979541de7b123267fe81f0190b0f6bb94fc229e05d1a0138ba2ec11a27d372dc
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 compromised websites, a common technique for distributing phishing lures or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on disposable or compromised hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://zoncmswebsitebeheer.nl/files/editor/file/zedimurivopaser.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/u3lafk71vq95hbvk6686noecu4/buvujowebuduzawuribumelo.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/78088387920.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16089eeaf05971---6598774227.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/60221033039.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/waboxezuj.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/58645917418.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1806b9810---43094967333.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/4kkgl7ktvgt4ljat76dco1p2k6/23153499750.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/fumekukojituviketadov.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/xixukulav.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/dizujewoxelaloparadavikeg.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a59a1ee7f8e---90060559254.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/jojumow.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/73573d6ad192af1126aa40caa69a686b/vofiwizelidiviga.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084e1c47e0e5---burivovalupuzagojumiru.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2917efd770923215d4eb028be72a8f70/guxuwif.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607476e440934---vurotile.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/af55d1a9fa493827b1ca05424b7f50f8/lerazatufokojepewozix.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb17c1c019---74003110881.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf888c98763---71178516065.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c962d8dec4a---gilanakixiwufemid.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/58330022808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=meditation+music+boost+positive+energyPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6cad9f2109f98ffbb5ebc80b6ba11151/86684218773.pdfIn PDF document text
    • 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_off0000c365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC365 11224 bytes
SHA-256: 2a8d360f9c43a46ef3d5d05ded72b09e0610af16793669601f6636f9386c8552
font_01_sfnt_off0000dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 17300 bytes
SHA-256: 46cae968e99ea28532cc8986699d14ec45ca8eec37b2a02922ebedc2286fdc73