Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c16f9d5df25b5a6…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 00:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 54d7767c2148c1d0ba1ceb18cae86e15 SHA-1: 063a54b70ad366a0bae99d831ad38fcca95e6f9d SHA-256: 6c16f9d5df25b5a68f9942ad4d6bcdd046eed17499697531edc1ce4fe25c8c53
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The PDF's structure and embedded URLs suggest it's part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://isabellepieman.com/userfiles/file/roxotenaxunewizesemosadab.pdf In PDF document text
    • https://musikkursus.dk/userfiles/file/gakepajolamefesasamemozo.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7f183f995---benovomefuwafaru.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/c25d62ce834c603c5db7dac5983de699/3271602936.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4eafc09d6c---mididatirumolamabe.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/56931339741.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/jebozax.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/kirirorevejozudimorobela.pdfIn PDF document text
    • http://sial.pl/galeria/file/52529360722.pdfIn PDF document text
    • http://teaneckhs1977.com/clients/67867/File/12159137452.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0r778ed6mb8msa8s3hc6vtk70/96705234501.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/b292c49e5033d757b83954c4bb3186d0/viwuduvokojes.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/22257392898.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/joxivaz.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/7d2f160961d8fe83833f5fc538e1cac7/40506656210.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/sipesi.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/tokidiluxoxudakebe.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/83103392095.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/692144cf8788c6dd61e8b686cc26c6b0/pevedelaxudusuleva.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/vomuxepir.pdfIn PDF document text
    • http://mobilenmr.com/files/files/22607514772.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/99966870146.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/damuzivegafoxenitevun.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f98158af7a---73818526033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=complex+system+definition+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_off0000e017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 10644 bytes
SHA-256: 01f333426a5c358fd09f04ab0699aa3d9b00eb524e354581076c2ffaac3695e3
font_02_sfnt_off0001108a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108A 18268 bytes
SHA-256: 3920fbfcb37f4d956b8e046b783ac1cca27717183b2434ba377995c592662b31

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