Malicious PDF — malware analysis report

Static analysis result for SHA-256 106ba0a89ea5d86c…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 12:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2260a14285f94c4372d631d6a63ee94 SHA-1: b86b2eadf21e4dcfa9cf923075a7ed8d6ea40bde SHA-256: 106ba0a89ea5d86cf164dbc2c797c7e8916fc2f2062b55332496a172988690a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136fdafe8757---12170278461.pdf In PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/xurinujovogere.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/xobog.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/38661359288.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/muniwef.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161325da9279aa---63785141587.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/38534620689.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/kudulusaka.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486e6eaf8dc---gufuwefenugepidokosukulo.pdfIn PDF document text
    • http://abnicum.com/files/file/89189851357.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/rosonedukirekibu.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/gujax.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f1e79a1d0---92277161921.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/ab689b44925b38804e71984f8f99db51/fajakotojebivefugujubage.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/74790581643.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/30575137519.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/setudalujope.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/5234495700.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/xuxat.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/korudi.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16139d5cd28820---pejuduma.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/70887905121.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a2dbd2f860750c877438b962dfca11f4/taxuriz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=layarkaca21+free+movie+downloadPDF 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_off0000b08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A4 10860 bytes
SHA-256: 4d3b09a7d8da21f9c8cbce8e8f875b80fdeed6a75c839681955202ecd382a52f
font_02_sfnt_off0000e1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D9 16352 bytes
SHA-256: eb50561c1eb1f7e85fff9668d2c0313bbfefe930836db134eb5c8018fb30e03e

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