Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01158fab7328d5c…

MALICIOUS

PDF

87.0 KB Created: 2021-09-01 17:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 94a6fce7d0b75ba0a1a2bceb297e9597 SHA-1: 2c20f5e51696780a38e326122f216c1454eaf837 SHA-256: a01158fab7328d5cdd92d14f1a459dd199cef157da36e7ed649bf5236dbb7d13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate it's likely a lure for phishing or malware delivery, potentially leveraging embedded JavaScript for exploitation.

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 http://scoutpate.com/userfiles/file/53453980762.pdf In PDF document text
    • http://yaeram.com/userData/board/file/27762431963.pdfIn PDF document text
    • https://slide-bearing.com/d/files/veligujegotivofowugodoze.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/wabat.pdfIn PDF document text
    • http://hydrem.ru/images/file/15608039668.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/wulijodojizefidizofun.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087204458280---73475390290.pdfIn PDF document text
    • http://sun-eko.eu/files/file/jipim.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/vanexu.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af95fb781ed---rufesekukuruzavamujus.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210610_B36EBEDC1EAD4ED7.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/jutexarejesotudova.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f15b3c06ae---85687967470.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/gawobomebu.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/93531071069.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/36146234132.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/9a2edb6c2ffecf85460dc6888d6177cb/jemudabekojegivom.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/78372427577.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/72bb9d7e90172778aa3452c8007e5fe2/zunife.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/19459011636.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/31903683794.pdfIn PDF document text
    • http://chlahb.com/uploadfile/2011/new2011617/files/2021/08/20210820184732.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/0644409df8fd5f5bfda81fd7c99d9b99/busurunajaz.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb4a24e278---faduwebemenetituvi.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/vivisapafanilekomuzu.pdfIn PDF document text
    • https://dm288.com/slicice/file/xuvazito.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/da4b65924367ead67c4d75a4fd4de136/33246293629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cbse+class+12+biology+question+paper+2020+solved+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_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 11684 bytes
SHA-256: 8078c207512737284ca5a59de5a814cf664d2d07e9f8bafedf70965e1fd0126e
font_01_sfnt_off000104ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CA 18568 bytes
SHA-256: 0afe5c5d18c67273119402cd439778f5ac3d93b0ec18c390369bcae88c802a03
font_02_sfnt_off00013508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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