Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ad0ea3f85798cd…

MALICIOUS

PDF

72.3 KB Created: 2021-08-13 14:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d992a4d09f21555f4cd79619864e7f35 SHA-1: 12d4bd91adaacb79e987e4f8ba87574983996e3f SHA-256: 76ad0ea3f85798cd160472949cf6bebde3c3d3bc2df084557393c8c4bddbd06e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging T1059.007 if JavaScript was used internally for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=tercer+paso+worksheet+answers+chapter+3 PDF link annotation
    • https://equator-maritime.com/userfiles/file/80715154161.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160845d542012d---16934111729.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/29f3b6ccfd80d17df565ba64f429fdea/fobetudowevitosevoke.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0ec75cdbb---buzokobuk.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d7f4dd6ff5eb59fa8fe6c8bcd9291b0e/2595710760.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/22992235431.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf3973714---sejuwivifilenozuzewe.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/zemomigizuxefesud.pdfIn PDF document text
    • https://hoalavender.net/upload/files/xezezigabowa.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/52155133653.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9805f0db81---nupagagebafon.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608994a051242---48378827960.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/bf9e0e3d18f02778bc5f3afa5a19c978/3494989575.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/35de5967be690a7d96c6dae01dd91e9d/dizijirasituxajegipabe.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/91138522044.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/77214881111.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/79014814e662fde98a028be96609857b/ninixarolo.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/rinezofilijiveju.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/38635409670.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/bavirenuxivilaxukixakujo.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160992c44bb507---jajozamegugexawe.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/fikavifenabivupa.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_off0000ba82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA82 16376 bytes
SHA-256: ae47f1276e2fd1a8a2d23167283fe25450275de29d3deacdeb335e54035f2c9d
font_01_sfnt_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 10648 bytes
SHA-256: 089083749c01dae5a2c378867a5f03338160b09230f0f7378dbabf354d18866b
font_02_sfnt_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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