Malicious PDF — malware analysis report

Static analysis result for SHA-256 662b019bc7d57a1d…

MALICIOUS

PDF

86.2 KB Created: 2021-09-16 05:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d003c09ffd9dc49f5dfa0f6d4e4e32cb SHA-1: 2d608883cd64b235756cc1210a71c97ef1daac36 SHA-256: 662b019bc7d57a1da0c832f57ee84272a3ac40aeff09ffe45de4775c69d79de9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains multiple links to external websites, some hosted on compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious content. The presence of 'cmd helper android' in a URL suggests an attempt to exploit or trick users related to command execution or Android-related lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://nacyc.jp/Upload/file/75575525249.pdf In macro / runtime command snippet
    • http://malabarisproducoes.com/arquivos/files/rotavituxojafomite.pdfIn macro / runtime command snippet
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/73361273948.pdfIn macro / runtime command snippet
    • http://zh-huaxun.com/uploadfiles/files/7518497949.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/kuvamixapegesedalixetere.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137cbeea2cc5---17140753192.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9b298ead5---45926480645.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/77914816424.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/vojegizomona.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/vowawiromevuruvibosezo.pdfIn PDF document text
    • http://holzbau-napetschnig.at/20977570421.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/29138661081.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/mowufetisesal.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/debajemalik.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/17432300057.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/18468839939.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/tafoxuriwavoposewovoxe.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/koredujukipanikut.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0784573af---wufopu.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/navujoritiporupopojukosu.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0fa9344e2---53190567552.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/83689251708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=java+tcmd+helper+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_off0000ebca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E1 10668 bytes
SHA-256: c95a6dc0a0b50816efffc30c40d4aee419e8562ce039ca62b85ade40676cf6af
font_02_sfnt_off00011c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1A 18412 bytes
SHA-256: e9a3cc1f1b685ea101d1d818e0c81fb24776ca45666d00721569681b8c0599cf

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