Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac14f4c84f784f07…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 06:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8235839d773a8003f2dc0eb8e41a7cc4 SHA-1: 7c1f672205faefc1251133092af941472d0da703 SHA-256: ac14f4c84f784f0789a8fa7ea2c7a8eb97e87b760340e05b2cde6d9c4e2ef19d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm strategy on disposable hosting, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic indicates the use of compromised CMS upload directories. No scripts were extracted, but the presence of multiple external URIs and the overall detection suggest a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://drkoopman.nl/cmsimages/file/fikotijusimepolujiv.pdf In PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/dd53e8c38fb0268651561ad2c1cf9929/gaxilepolow.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/29637844680.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/70078066832.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608264965a3d4---guferirif.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/ba0b1d0ecfe06f67475f6ff8fe50131c/kotilowasobozogogupijigub.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/kibikibobusijisogis.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210805210427581.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/d4c1c4e2ba6947abba796652ef030922/27168664628.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/6960872351.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b64cafa3399---muboginumanel.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/44861766237.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/zujitis.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/nagogijapoxa.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/7288809070.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210906_961B084C7ECF3019.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/83163059180.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/bofijubaxizixomugiwunel.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/tabumeraminitikuv.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/32799028968.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/kilekuluv.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/s298q4d37r7qllt8tep5gpm4f3/20775584866.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/38469984368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=rachel+de+queiroz+o+quinze+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_off0000dc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC15 10804 bytes
SHA-256: 398ebad4747e81a1677f1905d1fa4c8cce8e6de8e7f423b542b81fe5248b10e1
font_01_sfnt_off0000f4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A8 19808 bytes
SHA-256: ae1b1dabd4cf052cff72a7c23489e4a036f7082fd9bbdae2745767dd69eb4488
font_02_sfnt_off000125bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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