Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2acc83949cb731b…

MALICIOUS

PDF

86.2 KB Created: 2021-09-05 21:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 02c4fb31098f6c07c0019c8df3b93c63 SHA-1: c697efaaeff8aee5a1047223ea79d6767e47e0de SHA-256: c2acc83949cb731b55a399edfb82922ef2df9862524d5553369ba8167f60c003
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://coretry.ru/uplcv?utm_term=neck+and+trapezius+stretches+pdf PDF link annotation
    • http://imi.vc/upload/files/60121529601.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/xuvala.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/t1qdr10j3g00j2g9ica2vmagls/17898640838.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/67650775907.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/95093155695.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16100252a7c3b9---lilaraxojilig.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/komebubeferapiguza.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9335b3acd9---vutezuwemuwagewutidim.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab64ac18c9d---92002602135.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160edb6ddcda90---niwobap.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092c7067f1f6---71119728669.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62631575154.pdfIn PDF document text
    • http://www.moyekolodin.com/files/lujipef.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/lumedizafu.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/14771902598.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/71872087889.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c704bf043---zutipiniwojeta.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b6339b6bc3---91729457280.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/zikezasuropibuxovevidax.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/mudalofowad.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854970d6d2c---mabolarum.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/73907282754.pdfIn PDF document text
    • http://pileki.com/imgup/file/76595578573.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_off0000ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 10780 bytes
SHA-256: c05ce3e153f6692b92ae764c450f806f94e1f996d6b10d2f81507707551f7285
font_01_sfnt_off00010600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10600 17520 bytes
SHA-256: 2a6dbf57949cb24c4d7b90692354024372665d4dc4a8c91cc737c9ac65aefc65
font_02_sfnt_off000132d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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