Malicious PDF — malware analysis report

Static analysis result for SHA-256 b017cb9a6099bb09…

MALICIOUS

PDF

67.7 KB Created: 2021-09-23 11:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 76e5424a5fa88ced1be5b18da2b37d06 SHA-1: 7ecd8dff6032aa32b9a29b12ed89dd2a0068cbd5 SHA-256: b017cb9a6099bb09718805841efe8b78b2078f44e5a76ef2c7373713a2e72077
196 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress uploads or disposable hosting. These links are designed to lure the user into downloading further malicious content, as indicated by the 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ClamAV detection and ML classifier further support the malicious nature of this document, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=mc4+download+for+android PDF link annotation
    • http://hcvitamin.com/webroot/img/files/55071767901.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210907030248845.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/sapedapelesevowokamakeriz.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/tumuragudugebosegupisezu.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/jisopiso.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161374810e2d44---lurazevejisakatevupizosij.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/57706772611.pdfIn PDF document text
    • https://renetravel.ro/images/files/wumokopez.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3d1dbc2d3---fevunuvatibuxivagufa.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/zupuminegufobajuruzo.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/fewilu.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/rivijenafobazujej.pdfIn PDF document text
    • http://uco-kampen.com/media/files/baxisopiligugukividitafo.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d3c76344ee538c422ff421388a1a793d/boxenesizozamopogiveku.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/68112724188.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jobawubuxenazukusumeno.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/48352658818.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/gubaxe.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/67758696744.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/97438098569.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c1ead8355---lejidufezobodexixovasipas.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130a60d77a40---88961394584.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_off0000ae6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6B 10228 bytes
SHA-256: f8a308f0a05081f885680c1a108f5c7d8ba2e41ebb7bdfe79a04da532d400f4b
font_01_sfnt_off0000c589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC589 14396 bytes
SHA-256: 206bd183adbc054e7fe4f919bf926c8d113f191e0c3020cd226325f59d0478f7
font_02_sfnt_off0000e96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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