Malicious PDF — malware analysis report

Static analysis result for SHA-256 91de77e069798ef5…

MALICIOUS

PDF

78.8 KB Created: 2021-07-06 08:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: abeb83d22f519c95b050f60381371403 SHA-1: 9c2a9313430528ff39d76c70d6f987b4add1a477 SHA-256: 91de77e069798ef5c5a7fb47aaeb40ca7d5f1da92712608a3d277eed57f3fe49
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to trick users into downloading further malicious content. The presence of these links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://synerhu.ru/uplcv?utm_term=big+c%2B%2B+late+objects+3rd+edition+pdf PDF link annotation
    • http://curry-box-deluxe.de/userfiles/file/majufewurogasasa.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d80ad7c56d---duxunoxanumebokozofabesed.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0462bd8bd---32869375077.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d809be58bad---mizukus.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/ganela.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/8822cd5efaa9c405ebc0ab69ab470a1b/42550218643.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/b474ace38a42b5af3bce9871786d5882/56821331627.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/15551c7c72732d67485485d2d7194efd/jolalif.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087acdcb4ced---zawawiragoxujutipepaz.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/xirixetesezopiponiretibe.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/fhv6nisa6qgovagsraacuuklh6/zasuvowevobix.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/6921976252.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/o5qdpfrseltitg292c3iiukis1/55878538829.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/22890367052.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/nazub.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b431b0aa193---24494013529.pdfIn PDF document text
    • https://aokman-drive.com/d/files/vageveseponep.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/5f690c4b156663cf114929e3f9f251aa/97636820902.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/873ce232eceb2270be10758dd3d570be/likozo.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/36f7c9407c731fa948e8a86dd62bc9d6/38401557389.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/nuwulivokulokuxumez.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/b83f18c6f73ca0c01ba6af1085d22392/nurot.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/706a81a927b78186effbb826d7c893db/nejurowipaze.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_off0000cd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD47 11292 bytes
SHA-256: 38e23c8cd92fe23fd2a95f10fad20aa2834571e68ce6697b7c2cfdcd502c6bb9
font_01_sfnt_off0000e78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA0 17636 bytes
SHA-256: c2569ddf4fe0ad948e5fe01ef8ea8e0908720eb5e169139442e1096aac12c14a

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