Malicious PDF — malware analysis report

Static analysis result for SHA-256 960f5157a75bc599…

MALICIOUS

PDF

79.3 KB Created: 2021-09-12 10:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 983e145c5d46342e8767249d290baa07 SHA-1: 118cd30625c233cb279dd276430b90a23a6168a9 SHA-256: 960f5157a75bc599e672058bd5f92539ccc90ad62019063872a52f07b87eda19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised or disposable domains. The presence of 'utm_term' parameters suggests an attempt to track user engagement, common in phishing or scam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://catamma.ru/uplcv?utm_term=oneplus+nord+display+issue+fix PDF link annotation
    • https://tidaksusah.com/contents/files/kugupiteze.pdfIn PDF document text
    • http://santabruna.cl/upload/file/manirevowekiluxufiv.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/18736277329.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5514283636.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/kazofuluzexo.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/004490e8e584c161dfb0dfa6193419ae/44163130463.pdfIn PDF document text
    • http://starma.pl/files/file/51464283404.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/80088903788.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bff849751---bapijawibigojog.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/69925706171.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/71773116436.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/70852051366.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/2018975966.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/wavotuxudejogub.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/94834476382.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/36612302353.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/19146027018.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/xoxasekajuxipadozaraj.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/9006663014.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fe721a8b97e2f4e7ef1b8c2be154203/24586469826.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/37851146915.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/zoxatowogafijedudiro.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/desegunusulajumovuse.pdfIn PDF document text
    • 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_off0000d35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6C 16872 bytes
SHA-256: 09b9b249c961f6188ecdbcd2d4e15c02734a9e70d6984e9571020658547d4c71
font_02_sfnt_off00011781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11781 10732 bytes
SHA-256: 220c7d80b38015aaa2a1f86227c1283679f14b1c74e88efe584d451949533528