Malicious PDF — malware analysis report

Static analysis result for SHA-256 69b0af844e8edf86…

MALICIOUS

PDF

80.3 KB Created: 2021-09-08 15:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82ed441272e774f2f36503f243453af5 SHA-1: 16efd2ebb035c1e30a85e82e0c72c6367eba1e81 SHA-256: 69b0af844e8edf867d4312bc8cb5b41f4b295fecb61ec902e40fdc7a11f538ef
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161383017e563d---birapuvu.pdf In PDF document text
    • http://ablerexthailand.com/userfiles/files/77191239665.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/49772152717.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/ropozufa.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/fedazoxidev.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210907185135.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/sijejorakubovafupujax.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/kixax.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/68366164738.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/92267577425.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16138258dbf367---widinilodoboruxupozinarus.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133e549be8e2---birilivaxexusifuranuf.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/19596203066.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/16735181.pdfIn PDF document text
    • http://nature-revive.org/files/file/4615650129.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/29629168128.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/16056128251.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/temumadilixuto.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a3958f897b56451f56031ecabbcfbbca/zoluwujanepaweme.pdfIn PDF document text
    • http://synergyproperty.com/images/files/kitun.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/juvolas.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/mejuxivobotewepiroxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=wood+deck+plans+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_off0000d673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD673 17708 bytes
SHA-256: 1f7e43e5a877b0fc49b8bc5a7a2e55f351afd10b3d85ddcb61782eb16e601a2e
font_01_sfnt_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1B 10408 bytes
SHA-256: 450b4772801f267ff491430fbd892e7f13ef33e656dee29c6daa451613d884d9

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