Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54e6e7b18bcd19a…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 18:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f422cf71349676937f9ee66571b58a24 SHA-1: c817f07499ecc69d4eb407eadcd492d906c5a8b7 SHA-256: a54e6e7b18bcd19a4d53021cd657e7e8fd313a93b05986aefb3a61f6c6b8ebac
176 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV, indicating it likely exploits PDF vulnerabilities. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and IP address literals further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://jaqalsports.com/files/file/37381696858.pdf In PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/142a54ba8942d2b59e6460d03b3b13f8/33571206211.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16130757f08a76---64515305826.pdfPDF link annotation
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/36770656164.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/bigil.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edfbad6995---96253044279.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/47003778309.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/60317167009.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/61039206534.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/molube.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/puxosov.pdfIn PDF document text
    • https://medius.sk/userfiles/file/muxowuregutuvosexefux.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/robijafozu.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/riwepuwagikerenasepogagal.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/sevagulinaverulepopiwob.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/naligimujebo.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2d7b8ef88---ravosotitet.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/jatesepusikot.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/a13o6gu2mj36dad3df6tjds1k0/22158795573.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/junawutosiwirefa.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae6d0eb0f---nolabowu.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/40758842696.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/3462922824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=formula+for+doppler+effect+in+lightPDF 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_off0000b346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB346 16988 bytes
SHA-256: 63fc0069a2d06dbcbd1cea114d296601cf7abeba4fc2da059ffa3b7bc9ac75af
font_01_sfnt_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 10976 bytes
SHA-256: e2462547329fd933e552b9112ea1499082fbbe2a3283d5d28fc63f62871afe45

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