Malicious PDF — malware analysis report

Static analysis result for SHA-256 eece6691d3efc7bd…

MALICIOUS

PDF

88.2 KB Created: 2021-09-21 16:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 847073c31bc8a870791f99c8c3af647f SHA-1: a228efadf5a9ce1be2164505b54c59c661321021 SHA-256: eece6691d3efc7bda21940715dd02039b1be4ccbac9d923fa1b53f11c73cf658
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs were found, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm or phishing lure. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://aaaxxion.info/images/file/lirufitu.pdf In PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/lopalemegagisozufez.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/tapisubononunufil.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/kogokiwupedokop.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/dilodosimonanuzanarawup.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614808f4413f1---zidogowomisatubiwu.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/59592019167.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/7131537538.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/40294227622.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4b5700af3---12623602727.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/95761655827.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/kodoxadogawenofuvulezib.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/bubozo.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/774d8d29dc71d7993c79851ad201cf90/dadafufakovetaluxim.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/paratuzutatuzusekiw.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/91557689344.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/23596049601.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/64154743318.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f917b6bdf---64020115180.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/73450864788.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/betakapemunoguxod.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161496ff29dc3c---12654193397.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/93309178019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=evolution+of+species+2+hack+apkPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE65 20228 bytes
SHA-256: 2b4d17163c2f06b521a5e36f7f6d4cb11842b329133aeb0736bd78ce6835a5e0
font_01_sfnt_off0001024a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024A 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_02_sfnt_off0001181a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181A 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_03_sfnt_off000120a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000138bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BB 10836 bytes
SHA-256: 0b39250eecc8c4575d40625498d657907a9333fcca27bd89f323e6a07c60b82c

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