Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2592da298a2e2f…

MALICIOUS

PDF

76.3 KB Created: 2021-09-04 16:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 26de80085790400a0cc10db9398c84e1 SHA-1: bf8a8b82de69df3b7a6ab1c0450bdccc62ed6f20 SHA-256: ff2592da298a2e2f4b14144f84cbb7ea54b920ae792eccc9c0a5cf193a2289e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.urbanwaterways.info/files/kupuzoxexuv.pdf In PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/75a3dd5b9291bb55c0947090295fe44f/vivovowimusinegekizuka.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe1c562ab8---xadez.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021060606203973499.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/varivawubofifuwesosir.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5786ddff21---xawomekotejefezulak.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/j91hlolehutv11hioadq0h90cn/7180547898.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/0k8rd7t38q8ugo6e0ecm10mod0/zoramo.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/toxupafisuwowuriz.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/00b7b914e1fac95b2b5cbbdaae85b6ce/budekajizaruvawu.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/11463512724.pdfIn PDF document text
    • http://atomleasing.ru/media/File/waresuxura.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d52ffed8317---puvoleniz.pdfIn PDF document text
    • http://www.centralperdana.com/file/99821251029.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/813028c71faa099fc6776e6eb8c202ca/gijal.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/47372079335.pdfIn PDF document text
    • https://noddy.nu/images/file/wobupozugujaloj.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/5m632d5nah8n8qq1tp0t2miqt6/vasurugox.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jiep3lf8inseooe4p2rmb6cij5/87516446053.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/buseva.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/fajogefegenegejimofijufab.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/bd2119b602e8addcbd2510a0d37a33e5/49131039700.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ljk72al0qltqtc09uhe5s0efn9/28101348090.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/lujimevomol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=plantronics+headset+manual+co53PDF 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_off0000c723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC723 11040 bytes
SHA-256: 2ae61b4135251b7e3a6bc2f76fd1bf11adf114d09f06a7a8aad72996ebfc839d
font_01_sfnt_off0000e0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C3 16496 bytes
SHA-256: 1e736dd688c1284c823b94e00d0fd19b95c4d67ed065fe20f37c25eb121f2c3d

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