Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb183a7c407ba43…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 04:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cb700ac94dfbaf2d48c55baee938a89b SHA-1: 6ac89796416c649b72618d192b8e9adecb8abba1 SHA-256: 0cb183a7c407ba43d7682ea8f1fb19a4a8827158e019d62c0093c537393b82b6
176 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites and disposable domains, suggesting a campaign to distribute malicious content. The document body is heavily obfuscated and unreadable, but the presence of numerous external links and the ClamAV detection strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://mercerapparelss.com/userfiles/files/litudojaruzosonaxavezavov.pdf In PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9fee403ec0b9048d8a2a9aba8f63a15a/fejozovifigexom.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/66256614301.pdfIn PDF document text
    • https://teamcode.net/upload/files/retedujufuporixewotexede.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/pevofopafiguvuzeg.pdfIn PDF document text
    • http://vizcsap.hu/files/file/rupaxoxevuvap.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1631846966.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/45a92f7b6da5b0aaed4fb0a6b0e2dcaf/76260378519.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/23402a864be98e18f7c1da96dbcb3a5f/26848237475.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/xikafusaxewulabapik.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136146714f5f---futifazigagataxava.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/zelevebojonafekezobasolum.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/xavexejebevononabonu.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/16747647993.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/86350209226.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/bonotexodovegonekabekaxar.pdfIn PDF document text
    • http://machulski.com/public/file/89979234879.pdfIn PDF document text
    • http://starma.pl/files/file/wikawegepimod.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/sivamefevonenilufifojuve.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141384227eb6---88223601997.pdfIn PDF document text
    • http://slsnn.ru/content/file/daran.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143180ebbc82---ruxamexilazikesi.pdfIn PDF document text
    • http://metall-press.ru/files/vosoligasox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=video+mixer+app+for+androidPDF 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_off0000e159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF970 10420 bytes
SHA-256: a8b2bac2b1f1f71ff5015160eaf7a66288fb4b34a2ba580dc91a814946bc9058
font_02_sfnt_off000110f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F7 17272 bytes
SHA-256: 90dedc73a1eadaf69e63ecd3b5360e9dcfbb4f1ef053565243349500ac59457e

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