Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f89d09805446d0f…

MALICIOUS

PDF

86.4 KB Created: 2021-09-13 14:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 51911ff0030e16880e8efbdac4350b07 SHA-1: 0df1a0975ddd0a1efcf3dc5d9cee081403ea5ea3 SHA-256: 4f89d09805446d0f8afe856ce5fcdd3565054328cf8c538de2858973c5a1d202
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs, while some are marked benign, are part of a larger pattern of link farms designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.studioline.ie/ckfinder/userfiles/files/49738908789.pdf In PDF document text
    • https://toppelletmachine.com/d/files/3062229824.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/34844725516.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/46884300854.pdfIn PDF document text
    • http://wenxuezj.com/images/File/tupupibuwi.pdfIn PDF document text
    • https://windscrm.net/files/file/10965860611.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/40955575418.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/fuzikujed.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/60817906525.pdfIn PDF document text
    • http://moneymaker-gold.de/files/13592555936.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/rakorarofet.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/41220724038.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6ec9e77ec9819b8d7aca2bf7c735c183/8073762991.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16131a571461c1---jozejipejajeja.pdfIn PDF document text
    • http://www.moyekolodin.com/files/beninelatiruxurenete.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133838081413---59724804614.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/rutukawo.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/rewoxofejevok.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613347f327277---kosose.pdfIn PDF document text
    • http://tid.vn/upload/files/lawowof.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/70399871908.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361942116c8---39037219605.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/tiliziwinogetasogifu.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210907061941.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/gidixoxanudagobol.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/85367022808.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/71141366935.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109012221307166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+connect+android+phone+as+webcamPDF 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_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 18264 bytes
SHA-256: 3e7631ebf809ce820b560af36ed92302d99e860e835fe65014e3e97881daf763
font_01_sfnt_off00011ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC8 10952 bytes
SHA-256: 365836b075f4dfeca261dd6046d2fa117c0ea6fa6704f10c6aa094a69a2bcab7
font_02_sfnt_off000133be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1