Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ea9364c7da503f…

MALICIOUS

PDF

87.5 KB Created: 2021-07-02 18:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c0401e05df1ebb11ed8dad3fcfb9a2b8 SHA-1: ce8cc498fb1638f09b387b8c4f5028d3133a885a SHA-256: 43ea9364c7da503f2a3593c6b5a42901d723f1435addfe632f97ea8b7bd66042
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of numerous links on disposable or compromised hosting suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/e3018c643fca8814cc1dab68631fb344/gogipipukevoxur.pdf In PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607076a136516---jadewapugoxeti.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/runil.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e8c07a84566309b7df02b04bfd48cad4/kazabotomenewag.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/vudutaruvigopunejoxujavak.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/61564989248.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/72562873624.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/29411001219.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/mamamekejetiw.pdfIn PDF document text
    • http://hitoduma-d.com/files/files/5221797629.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac6411e123---13096739870.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/bc1e2642f0f4b7e7c5aa8879f3df43f3/98943045229.pdfIn PDF document text
    • http://orrizon.ru/images/file/lakevinadaxilizuvabamim.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/23646591939.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/nodabufulef.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6d378a76a---niropozetumebat.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5ddc875f1---vijudawidewosedef.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bf486fb08eb---64141919095.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/13627740922.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084df8c0c2f9---wokurixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=fingerstyle+songs+for+beginnersPDF 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_off0000f378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 17044 bytes
SHA-256: b48ad15cb59ba0fa6142384d4f52efed0b99f5c929d4cef0b42a1a333393784b
font_01_sfnt_off00011fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA7 10456 bytes
SHA-256: f9a4daa622af159de9d670a223b1bf85bc7392a065d356e8bac37ec7c51a9de0
font_02_sfnt_off00013782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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