Malicious PDF — malware analysis report

Static analysis result for SHA-256 1236e65065cbc4ca…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 04:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5717e37efbf128282e43df0dc1c6c974 SHA-1: 736abd29e064a12d3791bd4d263e9ad83d179c16 SHA-256: 1236e65065cbc4caf31f8b3b5b0642ce69c4bf700eeb2805b654d094956650ba
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/5snqc6h9jkugp1oqbs2busnvlh/besixujodukikikowijoli.pdf In PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/nuzilaxud.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/funujovotuluvovo.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/mizedetukawi.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b94f3a17f51---48234091016.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/panimafodore.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4be902af4---wulosefibozowajizukiligif.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/tijetefekikisuposi.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/8asn8786if9098glghe3bvjlg8/55396247419.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1629362870.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/jafabo.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1612a175cef98b---24716272945.pdfIn PDF document text
    • http://davcpundri.com/css/file/gorejegelabawixoxixugo.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/3806507479.pdfIn PDF document text
    • http://aceranalitik.com/ckfinder/userfiles/files/tipeleno.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/c6f1410bf53c3478be984cb9fde5ecbc/setobuzevolavokel.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/55164328445.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/98gci732mt61q7h5ve2l7bacec/bavinatiruxadevosifomo.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/8b9e184046b95a9132a7c3e8234b5084/rilixunibogelakojigubuj.pdfIn PDF document text
    • http://alhs1973.com/clients/64426/File/lutibezebituxawufekosodas.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/fofilovokozobuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=nitro+pdf+pro+bagas31PDF 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_off0000dc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC24 18412 bytes
SHA-256: bdd5cd5a9557d9f6b5cb45a19ff2a1868e90727522a8e6d2fcdeb2edc83b119c
font_01_sfnt_off00010c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 10732 bytes
SHA-256: 98759e8338de8070d4c6de440bd2d8f958a2982d5df3579ed104fd951ec0dbcd
font_02_sfnt_off0001248c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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