Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da3bab088b38f7e…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 04:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fad15996f485313cf486c43f28ac6586 SHA-1: 5d56fd73f63790617fe00efcc083fc3814f76dec SHA-256: 3da3bab088b38f7e7aabf51bc531227d23cdea7a23ebecdfc83d64d011e6d3fb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external PDF files, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute further malware. The presence of PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to host malicious content on potentially compromised infrastructure. No scripts were extracted, but the overall pattern points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://yuilchem.com/userData/board/file/39715218517.pdf In PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614237dc3a65c---gimexagevemakajewimitoku.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/guxasexajabitopeme.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/87168414690.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/89289433800.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/mifuvetebojatila.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614d91a79585b---28491926932.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/titegilirovixax.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/wupanavobun.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/7471518336.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/81052315167.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe8a446a63---wawitalubixaxarigafufazon.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/vusesipubadiwazezin.pdfIn PDF document text
    • http://platcometals.com/images/file/20690781856.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/wolamugutitos.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/45294897502.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/rededu.pdfIn PDF document text
    • https://mytopics.it/uploads/file/49134664162.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/pisizodixojasusevufugibej.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/diwimamegiza.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c632895886---rajikuzovagixikojiworunu.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/juzote.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac41e495cd---98539591523.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/0696aceb77dd78842f07c4575896213d/11097575614.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/75462701974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+make+a+protected+pdf+unprotectedPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a93b6484fced057d0352c17d1315a594/sepini.pdfIn PDF document text
    • 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_off0000b840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB840 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD052 15872 bytes
SHA-256: 0cd0b325f10b73109d998e54d73b29e8a14717044d862d279e15ed3659ad4fc1
font_02_sfnt_off0000f886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 10744 bytes
SHA-256: c450093a5ce2da7523b1a032c05ed45936bcec437232d279dc426e44333e4383

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