Malicious PDF — malware analysis report

Static analysis result for SHA-256 230f2e3b8bd2808f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 05:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8fe1e6715e7098e800181840739300d4 SHA-1: 3716d55ec31043a0fbaa6e1b74ebeccb55bd8dbe SHA-256: 230f2e3b8bd2808f69f5075e0145330863ed440f227258da880277f2dbd81488
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing or a trojan. The primary function appears to be directing users to potentially malicious content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/30b24706c53570ab720ff27e4aa9ab17/foditepopa.pdf In PDF document text
    • http://mintaialuminum.com/d/files/vuforimor.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/notomidisenapafajusefes.pdfIn PDF document text
    • https://csn-alliance.com/data/files/silegix.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e43f5e2049---piropo.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/vugojexogigibak.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/55364969314.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/mufof.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/leruwixevujexe.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075742c5a62c---jexujoj.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ae420b9e11b---bimazimosipade.pdfIn PDF document text
    • http://sherylrobphotos.com/clients/56056/File/99823127743.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f8937275dad---rofozatizivigugulebew.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/52904500827.pdfIn PDF document text
    • http://raczcsalad.hu/files/sumigiv.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c47df5ba79a5fa8c690b6720925ecd10/65670180227.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f985db7bfec---zikigawor.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/209f11504359c06ef27da33884b2d41a/86893378403.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb567c3efa---riwujoro.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/c0r4irt5jgl9eing2plqt79iv5/96360082031.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/sibif.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/61927602686.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/81374674538.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/jqtvt7iok2jssed1gkjgi4h883/miwedus.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160927f8e7bf48---zumomirejiwapuzuxebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=algebra+practice+problems+worksheetsPDF 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_off0000dec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D8 11016 bytes
SHA-256: b488b89d5f01012730e59f82dad9ec5c949ff4880a1b12a2b2e12fa7ac4e4bf1
font_02_sfnt_off00011057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11057 17328 bytes
SHA-256: cffe2ae13dc651db19410793546f6557aa353c4f7b417c68597e0bffa7df95af

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