Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3e82567812c7b0…

MALICIOUS

PDF

108.5 KB Created: 2021-08-27 16:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc3553a04bcfa2efb67eeaffe06ce9f1 SHA-1: 51e82fdb52468d34fca7178a7e05749ed564a1ad SHA-256: ec3e82567812c7b04ecf5043b46b6770a305276cf19e487c028c7d5bb47b4627
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://philabc.ru/uplcv?utm_term=machine+learning+repository PDF link annotation
    • http://marcobernini.it/userfiles/files/35870505137.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/beguzevekutafunabapokalu.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/27210776050.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/hv4o8nsi3lgrm9uiqd1rt2r5n0/57071910398.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/maparunirurekunimuro.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/jerilagivanagilonovotox.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/zodekevisubebujutomaba.pdfIn PDF document text
    • https://beaszemin.com/files/galafevavufaribitex.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/d6a9cafecca9507bac3038e0a7a3b424/zegule.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/93524608527.pdfIn PDF document text
    • http://fields-on-earth.com/pexebuvokegunex.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160db200dac6a0---39801350721.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/56091881105.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/jofaf.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/23707702159.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8dbdb7094---mozoxiwo.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d48a56113c---36466232364.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/59434459137.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/lixugopetekowoxu.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/9cf043407e183844866cd6adb0d1a744/bebevufilowagazokife.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/28b6a9617cf132602034ac9c29406e89/80821265275.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/netil.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/felufujebin.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001402a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1402A 10760 bytes
SHA-256: df5b59ee67c66e3feb4fcf9cf223cd896f943f67568e22ca0b3be45e0fe6ae6c
font_01_sfnt_off000158e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158E1 19652 bytes
SHA-256: ebcde5b3074b8aaacbb3f003d5d3b5054b6c61e1c6387436d87fced6204a44a0
font_02_sfnt_off00018bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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