Malicious PDF — malware analysis report

Static analysis result for SHA-256 5821adea4e967801…

MALICIOUS

PDF

89.6 KB Created: 2021-09-20 05:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 685e942b5989b17a698f1a329045726a SHA-1: 6f22cda3d98a0ab7cfbeb8d716ff83858672891c SHA-256: 5821adea4e967801c653fb1fdd8913c8a8bb805dc512a7c1096a0811d4b41a59
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 platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://khautrangkhangviet.com/upload/img/files/9855389987.pdf In PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/mibatubigexax.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/a9l6mdu39imatftpfb17akgf6f/lebapawa.pdfIn PDF document text
    • http://netart.hu/userfiles/file/11812303770.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/jejevivonobukofisuzezok.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/56329632457.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/e5c8210ba3f0c024e2eefa3896c2e88e/kisafefuvavafeb.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/vetamolumevanawevodevirop.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/10265878926.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/25040464808.pdfIn PDF document text
    • http://zamgph.com/uploads/file/071835106462.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/fewukuzawejofaken.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/newetepejuluwawuboluku.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/galafebi.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/bizusapajimako.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/xukatawiwufaguf.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///38464836541.pdfIn PDF document text
    • http://gojjang.com/uploads/files/fevoxogozusuxu.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16141218829006---76883604527.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/37547792686.pdfIn PDF document text
    • http://www.bash.cl/media/file/nuretiv.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/34649685585.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/sokesitigitegoj.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/38401439270.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/68621456902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=android+restarts+on+its+ownPDF 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_off0000fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 17936 bytes
SHA-256: 9347f386481b87c4f5f6d8521f879f0ef45639b4fdc0f31bbee917f175c5f776
font_01_sfnt_off00012984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001419b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1419B 10260 bytes
SHA-256: f39af4c13c2f3718c38306bad9e39d0493a1166f992f6ad2b0d36661d1875243

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