Malicious PDF — malware analysis report

Static analysis result for SHA-256 779d75282c849aa9…

MALICIOUS

PDF

90.6 KB Created: 2021-09-13 20:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6dd7be187039e90f6e6dfbd77193a865 SHA-1: 4a0ee6a04dc4ba56bb93a205b126c1f7da564ef4 SHA-256: 779d75282c849aa9d6f32f4945d734afddca4d2f6567f42d55ad4f0a9fcc0b16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users to malicious content. The presence of external URI heuristics and link farm detection rules supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://medvor.ru/uplcv?utm_term=api+level+29+unity PDF link annotation
    • http://himalayakebab.com/shipinc/userfiles/files/vurida.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/b3v0svai5nef05jus47f4n2415/dolalodeb.pdfIn PDF document text
    • http://videocycling.info/files/file/vezujelorenukad.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/2c8389049c211173fa5b760f23e5557d/sonapejalitixajaduv.pdfIn PDF document text
    • http://badgerhillfarm.uk/mirupukudituzu.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/50811721767.pdfIn PDF document text
    • http://hiniceshine.com/upload/63987478540.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/24383255323.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210906080628.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132570ddf9ba---76056764030.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/11708629337.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/20662811467.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/5289810572.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/xudujugonokaxijirag.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/23886744889.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/serixetugusojefejujire.pdfIn PDF document text
    • https://servicepapik.ro/files/94036530201.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/76338666563.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/19249317301.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/dorabiji.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/vosus.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/88688582731.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/54045701963.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/mikiruremav.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/rotederatud.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDA 10244 bytes
SHA-256: 5a9fbf3b1d861821fbf8ef53cc2231b974d5861d3f16d07d06bb5dc58826efb8
font_01_sfnt_off0000f713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF713 2476 bytes
SHA-256: 9e66068f7408fdcf011ef1eb05c90253355693887616f61eba9e63f900eaa60a
font_02_sfnt_off000101e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000119fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FA 24728 bytes
SHA-256: 9daa8e31249299e8998d599506488f7a4fa245c44932cc0cc2225bae7d521325

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