Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f940a7d8d98c9b…

MALICIOUS

PDF

94.7 KB Created: 2021-09-06 13:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 78d39cb53895416370affeae080e09d8 SHA-1: 056933b286c4ede682255c39fc948224436de227 SHA-256: 51f940a7d8d98c9bf2fa198076707e4503506a9722fd329ed34a024bfcdbf858
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/1bb25900d110c2101a8e087d16dca0d3/9481202685.pdf In PDF document text
    • https://tectrongim.com/uploads/files/38174395273.pdfIn PDF document text
    • https://e-midas.ro/files/file/zowuxetobatekedivepafudef.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/98380453172.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/razidusenev.pdfIn PDF document text
    • http://miracleschoolministries.com/survey/userfiles/files/xipivozu.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210716_666DDBAAA74250D1.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/70099549548.pdfIn PDF document text
    • https://migger.dk/userimages/file/jasezizu.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/widifumafate.pdfIn PDF document text
    • http://palami.by/images/file/mefejunitefajako.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/wokone.pdfIn PDF document text
    • https://shopabrang.com/images/files/pisemevikesibevorivomawif.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/1941567336611303b5503b2.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/gisuxeku.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/goboxakij.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b500d8d033e814845ad62273438b4628/sozuvefo.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/70097605567.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/88651182480.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/30442990338.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2773e4d147---17129045848.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/3fb1a05e6464b1aa5cd15937e5afd813/88166030114.pdfIn PDF document text
    • https://eternalbliss.net/file/gitinu.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/1269869617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=coombs+indirecto+en+el+embarazo+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_off00010a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12237 11012 bytes
SHA-256: 8bdd79f1fe3a8aa85089051724d15d149db074df28c750790ae51ee729d5bd84
font_02_sfnt_off00013b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B98 19404 bytes
SHA-256: 5309d40c13132263bf35fcb71c815702ae26a40c444b8a0ce6ab6bac32cd2538

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