Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2b63b6cfb88542…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 13:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 58463c07bfd177f077be85a02bc485a1 SHA-1: 2675be6cde03e687a6055ad4b2a5c5777f4c36e4 SHA-256: dc2b63b6cfb885427436c0a0dd9f73720731d5e79528f01340cbc9ef126de729
176 Risk Score

Malware Insights

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

The PDF was flagged by a malicious ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and a link farm heuristic strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://associazionedynamica.it/uploads/file/fiwarunafefalux.pdf In PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/mezevilupifudiv.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/74949577742.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314db77e8bc---84319367081.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/zugabupokobozisiwonawezar.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/81694171477.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/suxarisorubobovimarobaliw.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/riwexuvaj.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/vupipexoga.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/rutusa.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/33629768293.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/3365986836.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/todelabesonoxaxa.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/xitadujelataxaje.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/0846c1f8de79d3ab89b40ca2c0904952/35657845739.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/xoruduzajizax.pdfIn PDF document text
    • http://wdnederland.nl/file/nolejiwesopobavebuwarafup.pdfIn PDF document text
    • http://gotween.com/userfiles/file///donililopusekifujeji.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/puxakowi.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/87657506346.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/rarorozaweno.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/6b2cf39a4fcaf84a668c891c9e9080bd/xuxosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+developer+bridgePDF 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_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 17568 bytes
SHA-256: 105804daea204e79d707b45a111526c61062a865d0902f19eaaf7f5c86596b70
font_01_sfnt_off0001088a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A1 10328 bytes
SHA-256: 82bb296f207af564107b98e8fb39225a5181ac9b7ee53a7b59d428a786f46e88

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