Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4b1bda6e1aa267…

MALICIOUS

PDF

72.5 KB Created: 2021-10-02 17:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e42107280f13e91a47736b14189e4c38 SHA-1: e876498679f518284628425d509e6904b788382b SHA-256: eb4b1bda6e1aa26758feab63f9ff974fd466038b5f60ca9da1f7620502e0517c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://felicitareonline.ro/ckfinder/userfiles/files/jukemakelagubivuvixowule.pdf In PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139caf6a1a17---vesezonoxebulunifo.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/72354848110.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20211002_202103.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16153920f48da8---9137751781.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/fezipezefusedosidogatel.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/28053849231.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kunizovitaro.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e40880529c---xejekexumilinikowupatamep.pdfIn PDF document text
    • http://rvhifi.cz/files/file/28686159144.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/19490489763.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/67974846053.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/54288551059.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/zesovojifezofixixevuzuvu.pdfIn PDF document text
    • http://spakimthi.com/upload/files/vabiwuzesakasojop.pdfIn PDF document text
    • http://metabolit.ru/files/file/siromazun.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/59442354178.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/48664032963.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/40155928708.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/vusimazide.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/37271759097.pdfIn PDF document text
    • https://cristalensi.com/public/File/94416477629.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/35662417003.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/9921237957.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/51096737711.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/39566884600.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/32437674212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=current+affairs+december+2020+questions+and+answersPDF 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_off0000b753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF65 16292 bytes
SHA-256: 738d54fbd5e6be4f8888e90ad202c09a20abaf5d329bfdb971c996997b1f2ca7
font_02_sfnt_off0000f8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CB 11336 bytes
SHA-256: f79097b29fe352e18801d3cc9025dfcd9e289d1da1f221a03dc6c9448575ab66

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