Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d69221ed89bb7c3…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 05:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 11610fa21b14174a53cc2337e8e4bc92 SHA-1: 114b76231ff06748e3609b5fc65be6c363f54102 SHA-256: 9d69221ed89bb7c38580d764c53fee6d016644efcd3591c4ac3bee5699097ed7
156 Risk Score

Malware Insights

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

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the PDF as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. No scripts were extracted, and the document body was unreadable, but the numerous external links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17ee9a488---voxaruliboti.pdf In PDF document text
    • https://groupunsur3.com/contents//files/lujolipirabegam.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54a5a6419---63031655618.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/56125969873.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e610612d27---lusaju.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/26423541817.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/gosejokawovapomuk.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889ec119bb6---8266267838.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/39210673328.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/g9bblb5jdp0eps09pab1l1ibrb/89791569029.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/4a219b969f7afe6e6a99adeb45d84f47/17581093047.pdfIn PDF document text
    • http://fotossc.pl/_files/file/29207792478.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160944a5792e0d---40698621860.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/2e04e2f66bd56701ba8a0444b207ecc4/83695469400.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/13991795938.pdfIn PDF document text
    • http://northcity.rs/slike/files/tutuzififezaxejalote.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/lakiregi.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dae82ebcc---tawap.pdfIn PDF document text
    • https://blogsma.com/files/39725061838.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/43b0940380d2e67fe79507789882ab19/titumogumerixuzapugejoj.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/pimexawivejev.pdfIn PDF document text
    • http://broomfield82.com/clients/4/48/489ff1710263d1ca947d92387d56c809/File/nixuvejezoveve.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/fofifun.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/21328139402.pdfIn PDF document text
    • http://ocean-ex.com/images/blog//file/jiziri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=buda+ensinamentos+pdfPDF 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_off0000d625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD625 18020 bytes
SHA-256: e5ab1b68b707d7fd5529855d226507c3e0883298f2b21a35937f26fd9e6e01df
font_01_sfnt_off00010371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10371 10664 bytes
SHA-256: e264954ca3ea8e5d601af12ce46d0595fe8da8702d927820564a5fac3b669730
font_02_sfnt_off00011be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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