Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a51cce9a3c223aa…

MALICIOUS

PDF

73.9 KB Created: 2021-07-05 17:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97052d6c7c35f81b372bb06e8ca2e919 SHA-1: 0f82e035d730e75bde3a200ab7912ba0aefc6b13 SHA-256: 8a51cce9a3c223aa3086850ed4a982fa0a438be63c93e10994da4f88f987d6de
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bezpiecznamlodosc.org/files/file/nogujegokidunefuwalasex.pdf
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/garowaxijupajiwiju.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fc43938dc---31320424299.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1aac98eec---mofimido.pdf
    • https://iwnta.com/userfiles/file/tiwufozo.pdf
    • https://accuratesearch.com/userfiles/file/91026767059.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/si7r8huph70ebh8nlcdj37m1qd/guxakatozolikejoxugus.pdf
    • https://allmassage.net/upload/file/20210605073348.pdf
    • https://arvikabc.com/images/uploadedimages/file/4000815821.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/16249425692141.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b9319715f---58259860526.pdf
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/14916035332.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071f9c9c2d99---47637042631.pdf
    • http://kojeneckezbozi.eu/userfiles/file/wafuwe.pdf
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/59216371660.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n3jor6l6lkri9tgmnjf0d38qe2/ruwiravegeperox.pdf
    • http://sequirk.ie/userfiles/file/junaguzamefejef.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14ee614fa0---vevisekoxopirijedigala.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d415fc666f---zeduzikexapalewejogiji.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160989ee6e1d9e---64323642470.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/6pq4k1j4cqmott4bu9ev3srh06/16019489865.pdf
    • http://artside.org/data/temp/file/nojosezu.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5910574706---42572904074.pdf
    • http://alexhofford.com/temp/files/file/lixudujixozodu.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/4g0j1euhbs9fvlerm6tlpstc68/47950342128.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079b2745d802---woviwakalorizet.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+bet+questions+and+answers+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0b2.bin
55a2bfdb7eb55383cb418c48ab34adcb3975997a122b759358122c79f91820a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B2 10984 bytes
font_01_sfnt_off0000d9c6.bin
339fbeb82525a3f5607cb5a9f51b18f50bd516f1eeaa2d1646a08e31358a8c08
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 15780 bytes
font_02_sfnt_off0001020d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1020D 16792 bytes