Malicious PDF — malware analysis report

Static analysis result for SHA-256 871d53401c62d076…

MALICIOUS

PDF

88.3 KB Created: 2021-09-03 00:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 043596a6e724516bb4086cc55ec91cee SHA-1: 7e3bf01760c0d26ac40cbb7147d60a4e87230f37 SHA-256: 871d53401c62d07685282f9dbaac70fcaaae48fea7015e63c6a36b619d01884d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm with numerous URLs, many hosted on potentially compromised or disposable domains, suggesting an intent to redirect users to malicious content. The presence of these links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/62888778064.pdf In PDF document text
    • https://puppometalli.eu/file/25958715668.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021081213574528.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/18474722071.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/niteverasokobuxanig.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/tduqok85rp5ioqe2g1ar174h0f/64515043284.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/15800843005.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/06/20210611172825.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/11686733327.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7a719bb05---putaravuwigana.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/sifedepejevujurujuden.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607275de61c4f---21541960032.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f819e6869b9---pulipud.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ded74035a5---mipukiv.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/vozoxem.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0cb7da23d---12269269874.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/54403304245.pdfIn PDF document text
    • http://lovesenergy.nl/file/6128915640.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afdf818664---toperaluliwerawibidadop.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/1d3c9517fa56fa12de9e31e108fa7893/xapadesuwasafagexuriwanup.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/2vil2v50i87vtn49ms0pv7ljs5/41518873308.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210903050517.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/sofejad.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/tukosotenukabenorosawafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=carry+on+my+wayward+son+piano+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD136 16180 bytes
SHA-256: 636b19478285e6db5d527298ebc0b4dcc543b902ebd982274a3abc41d27b3c06
font_01_sfnt_off0000e6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F8 10612 bytes
SHA-256: 6f23df1016b0be6ef7fc2a691069eb883a64aba27e6d649da09156c7713d3d2f
font_02_sfnt_off0000ff3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 22832 bytes
SHA-256: f8e0b470e6ace8ba76ac2d681bd0953760a0ff7d24e5715a4db90ddad1efd3ef
font_03_sfnt_off00013af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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