Malicious PDF — malware analysis report

Static analysis result for SHA-256 539ce02ac2c33bea…

MALICIOUS

PDF

78.9 KB Created: 2021-06-26 15:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8240ab13fb4861c70c7a9d72e3758de2 SHA-1: 7503b78dec5899cc562ba2338d1edfa19ceb9994 SHA-256: 539ce02ac2c33bea7982d411d61b05b292c84134d142300afe9e4f608cac8f51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=preparatory+exam+papers+september+2018+free+state+accounting PDF link annotation
    • http://andreaslasnik.com/data/files/43762727262.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b451c0a4a3e---28712321810.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/jojebiratelanumuma.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/76ec937cef8aacd929809474500ead1d/bugog.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/zivunokujub.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160d19b58c45a2---wewibotulolo.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/75731778026.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858c2745e44---kozabipepekepokujem.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/20844011030.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4e0d5360b---52746675384.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/293e2a07a80e8fc37fa3ea77236a5568/mejonegapawilajemodemu.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/vopiwamo.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/rugitelijonerafolifig.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72c8c53e1f---74983215045.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5eb697db2---vavatodi.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fonoxatifizemububip.pdfIn PDF document text
    • http://klhl.com/userfiles/file/tidadadufudubomo.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/26544310238.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/juzewa.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/5112090827.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081abbbc37f3---zupoxib.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF73 16416 bytes
SHA-256: aa096aebc21ce90a0a155262d849d665d9b508e64273c206b1c1cad58f163efe
font_01_sfnt_off0000f9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 11736 bytes
SHA-256: 5644a3cf4dc8ec0db61feb3969ddd872ba8ef41ed9d5021f3c74d41e4f4028ae
font_02_sfnt_off000115df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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