Malicious PDF — malware analysis report

Static analysis result for SHA-256 8313424b4ed2e063…

MALICIOUS

PDF

75.8 KB Created: 2021-07-15 15:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bc1e7352bbfdfae3ac97bc527fabfa0b SHA-1: d19b06f6e9887c9a79bede8c692f87207e93fa38 SHA-256: 8313424b4ed2e0633200c56f1115028417d60b365b106dc18caede09216d6307
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://iohrp.org/f_files/files/xizevedowerepan.pdf In PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609409fc9a53f---57589666219.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/ij3ut8apne3fetdugvcspmg7e7/ratokapukuninez.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/tojaxe.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f4e9ea5d17b5468ba7648914c15d2034/27560373666.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210612130325.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/livanelivuroman.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/84193282398.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2ee40fde2---lopobobasomizolamu.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//xotulonuferotolo.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160896c1cd9cb1---vowidavanomexufilif.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/1837696641.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/7bbe218af97c48d38017878a17cf1a6d/58353833143.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae98a6820a2---54679002139.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/jugosemego.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b3953e079---38942497333.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/37fineoi0t532qhsikbhc2bmg4/tutuxarono.pdfIn PDF document text
    • http://yuhongzg.com/d/files/17516687112.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/zaxafu.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/nametulajerufetunibis.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608de4bd52058---gajonixijefuwekufotex.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/753a6dvtri0egg667omksdummq/75218965670.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/pajegumudokemusuzaret.pdfIn PDF document text
    • https://noddy.nu/images/file/fifuseru.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/loder.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a47f38b1da6---bakafuzokutelezeguwokotat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=annexure+1+form+pan+cardPDF 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_off0000c7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C6 10612 bytes
SHA-256: 347ff242866e3957c593c636aa007f1d74b5c437b78a1874a5a83ef2ae1176bf
font_01_sfnt_off0000e012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE012 16164 bytes
SHA-256: 9a5f405086b6781785534ec74b7f223947ca2435bb735c5661dd501cf2554bbb
font_02_sfnt_off000109e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1