Malicious PDF — malware analysis report

Static analysis result for SHA-256 98dd300a9ac135d0…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 22:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b5afcded51b0412282f5f186d0bf2c18 SHA-1: 0e59834f3ec5ca81faef89259af67375c20de44f SHA-256: 98dd300a9ac135d0159be18f59e120893f2e0495bd77a65f0c2fd1b72fc180ce
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://avandcie-energy.com/ckfinder/userfiles/files/89324863168.pdf In PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/14871041294.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1630768158.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/20576116525.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/powajuxewetopatadufafelu.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/mekeb.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/73909424430.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eecd9882c4---zifajefe.pdfIn PDF document text
    • http://vo23.ru/upload/file/40015994050.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/28169005373.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384e47983c0---fewefitapujotemeledipo.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/80778739453.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/58184823574.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/erkn3llifd149cviokroje68ar/vizuxarexirozijot.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/53760599023.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/a15e92e6bafd011252254790108be7d4/sewivavoxigepepikixazunub.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/vutililejadenokoxoge.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/68232138490.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/kafugexokudebalobe.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/forijokikipubavixojugewef.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130700569ddf---31882912405.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/26609411512.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/wubovama.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfc47f2cc6---40973196453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gangstar+new+orleans+modPDF 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_off0000d1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CC 17576 bytes
SHA-256: c6e4b3c0b9669ab3b9947343fc1900116b5cbc6b4bbe941616bb85608b71a175
font_01_sfnt_off0000ff3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11753 10624 bytes
SHA-256: bbdca2dff7b15494b74513c9aa2d1221a4a71eabf4a43fed87c9be3d92bdf973

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