Malicious PDF — malware analysis report

Static analysis result for SHA-256 078eba67c56554c3…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 16:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4e632eb55a110c15f494de6dc554e8b7 SHA-1: 091d1275d5c8324d52f96330e415f806c543bfc2 SHA-256: 078eba67c56554c3691eefa025e920be17a681bacc5930fa04332e3624710c95
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple disposable hosting domains and compromised CMS uploads. The embedded URLs, such as http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fbe836e16---94988950705.pdf, are likely intended to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://yjsyrj.com/userfiles/file/nugevilavebogidilirebo.pdf In PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/fuxudejorikubinizorazak.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/nukoboxigibob.pdfIn PDF document text
    • http://ciskmv.com/css/file/tiruvizifurutororazawo.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/zavap.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/gatetewazazaw.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161302c1a8860a---nazarekuzekimo.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/33826628780.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7ef334686---jidazasamufegudozi.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161354c8c31e8f---milul.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d5e6ae04b---zofemoxigapiti.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/42246962774.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/noluzelem.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/losatu.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/48251201252.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/juvutosefana.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/siteditaxefuloturuluvives.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fbe836e16---94988950705.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/xoputezodiz.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/xawijipaxiluvuvidejod.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/11297682437.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/io57fihsdtehrc1no6294m8j90/wogiludefemonexemamin.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/48193435375.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/kixevudubume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=jio+tv+mod+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 17524 bytes
SHA-256: d0b781f3599c0c07dbbfa77e03ae233f16374761a455a5bc1d7b807849af8b41
font_01_sfnt_off000110d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E9 10152 bytes
SHA-256: feb441305351babfb4a25dcc87cb63b30c5c94ad7fb6e8487c9db048613ae80a

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