Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10bdc4b3ee23e08…

MALICIOUS

PDF

84.9 KB Created: 2021-09-19 09:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 684ce745eda6786f91040bc06c27f5ab SHA-1: 9beb8e04595ac2f954281724a24743c6ab86d3da SHA-256: d10bdc4b3ee23e088f330c883ce9252014158d60f8ba4b476fb1fce13c0adc1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV heuristic firings strongly indicate this PDF is malicious, specifically a phishing or malware distribution attempt. The document contains numerous links to external websites, many hosted on compromised or disposable domains, which are likely intended to lead the user to malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://phuketwebstudio.com/ckfinder/userfiles/files/81730713437.pdf In PDF document text
    • http://findingthegrey.com/userfiles/file/98260810437.pdfIn PDF document text
    • http://full814.com/upload/files/kefol.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161349ad460a54---fuzobona.pdfIn PDF document text
    • https://matkinhantai.com/luutru/files/80575648134.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/dawiwi.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/kejuzogo.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/93201453420.pdfIn PDF document text
    • http://topas.lt/userfiles/file/kanir.pdfIn PDF document text
    • https://ms02bet.com/contents/files/jujubinumawaxawexetanobi.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130f8d0ee780---sajojasixunanutoledekape.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/78655940246.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/muxajuginetek.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/wigute.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/79220104539.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/3a94e0d497d689f6bdfc7643ee859c31/27993616947.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a5d199e2b---69157202115.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/c8c7b80c9ed1e132cfd78284ba31e9fa/masesowusugewe.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/pifatemodoli.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/72149189009.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/teleremuku.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e9434cc31---ralafejabeduduna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=defraggler+for+android+phonePDF 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_off0000e80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001001f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001F 17620 bytes
SHA-256: 014610629f07bc16c3ab3bcea0a57b79f3cdcb4ae7ebb5f34be2408f2f79be45
font_02_sfnt_off00012e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E41 10512 bytes
SHA-256: 1da3dcb12ca696e8f9c4d307e09b6091f84f157df17031b221fe7b8e8f1447c3

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