Malicious PDF — malware analysis report

Static analysis result for SHA-256 444558c4f3ddd31d…

MALICIOUS

PDF

98.3 KB Created: 2021-09-05 19:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 541db5b6c778496a1ea53cc67ee76e2d SHA-1: 28f25990674a2dcac9e3358dd182473cd10132fa SHA-256: 444558c4f3ddd31ddb3c53f4836d6906dca8adf9ef6a29eadd37be53523e6144
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external URLs, many of which point to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the conclusion that the document is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a93767ba7---22018081255.pdf In PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/21eea9e2586f2ea6ad9c2a4b05b9cd0a/27058223850.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/96a59f010a2ed05e505d053fc71285a4/34085591271.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/15099544874.pdfIn PDF document text
    • http://thongthien.vn/upload/files/69960593437.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/72q6kqv6p1mdi8odcsgg9qhs70/47803144878.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e225276eb63---nowijenabopatidegujuvob.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa38c3e1f7---sutuwojabutemitolixanojad.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/jasagulinibugif.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210823143733_xus7yd.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/40674481711.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fda713eb757---romujik.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/40924660114.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/67534064712.pdfIn PDF document text
    • https://limsurdua.com/contents//files/66416386181.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/zunubazubinejokuzenubof.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/munejatetugawikowa.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/kagaxuzuzenitu.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c2d6a84de2e3ef6511657b6deb023f47/76422463204.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/kawib.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/10/file/meniguwul.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/valuwazoralazogugenoja.pdfIn PDF document text
    • http://henca.com/files/details/file/zizanoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hazrat+nizamuddin+auliya+books+in+urdu+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_off00010ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF6 11024 bytes
SHA-256: 48a4bf2fcc51c1f3f30c77cb34e30897bb1c9a98cf674dab4b8ce3379569f643
font_01_sfnt_off00012853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12853 21736 bytes
SHA-256: 5133534ddb756886443a9db8e4a798c22e5fea34ace19de7c14fa64559a3d747
font_02_sfnt_off000161bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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