Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8431cc4f72e7849…

MALICIOUS

PDF

79.6 KB Created: 2021-09-21 16:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 92481d7029d3b63901c40febfdadf439 SHA-1: 8f9b654e45aa34e4be9f3d3ab5e3ec70fc80d239 SHA-256: f8431cc4f72e784926912821a44334dc04d3d097de8d7d2faad5274be7033196
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution document. The presence of numerous links, many pointing to compromised or disposable hosting, suggests a link farm designed to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ieeepes-thailand.org/app/webroot/files/files/56789928058.pdf In PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/danifejugigeso.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/13301088344.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/fotunaladuxojifinif.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/33805643197.pdfIn PDF document text
    • http://irths.com/upload_files/files/91609896746.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/95877615111.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/99957138036.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/40677346473.pdfIn PDF document text
    • http://att-na.com/upload/banopafu.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/9m7s2i39fmnp6s3eq0opn8sktd/47490477167.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/15248253040.pdfIn PDF document text
    • http://seedcambodia.org/htdocs/cljr/data/files/lebunarelixupawev.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/71239937093.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614092d88ed90---zebezap.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/44243601040.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/wezigarimutesata.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/69849867772.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d65db937f101a87c385d9e82325a4f19/66725160415.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/vujirujutedokikivalava.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/87254012355.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/wosekivuvidakuputu.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/22572181807.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/55222603936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=car+race+game+for+androidPDF 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_off0000d4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E4 17012 bytes
SHA-256: a49993e524d8f7069db12c92ab1555560448bd470f0b9bc758c7a701dd3d9b88
font_01_sfnt_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FE 10540 bytes
SHA-256: 98ce21d9ae3a3ff6f3f7ddc43691ab4126fe5d5e4b6ba43db6d39d43ee6a3149

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