Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8aca8550fdbf1bb…

MALICIOUS

PDF

90.7 KB Created: 2021-09-08 04:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 153aaa70ec6d6cc94e0c096c0aaa0e81 SHA-1: d7921701ea4b8b33a72b37452edbcd1bdedcb065 SHA-256: a8aca8550fdbf1bbf0b367af880232c61407201de0671743294ff81da57a3f1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on disposable or compromised domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://espicycooking.com/files/file///35473940607.pdf In PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/75543056686.pdfIn PDF document text
    • https://micsys.in/userfiles/file/tesopulikasadexotak.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/73142223406.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/2118951610.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/70589327959.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/42298185366.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e12f438e1ba---kuwewi.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/18b02vfovi45ninhdjdtkom621/savademawexikugabajizamup.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/92208047090.pdfIn PDF document text
    • https://bursac.net/userfiles/file/1382771100.pdfIn PDF document text
    • https://globalquestconsulting.com/userfiles/files/46296110930.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/nqoq28nfquuakbeaoo3p3tv5q6/depawiguf.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/972748fa576d8443a0a5351a22670fac/lalinovasakujat.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/79682924551.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1812b5dbf---55150606507.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/74247106409.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/liwosijukoviver.pdfIn PDF document text
    • https://arerp.kr/data/file///fozijusatevefe.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/salulasajozegetibepaborom.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/61046303168.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/2kkds40bns1hmioet3l8iag44m/24537230900.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/37624725194.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/b3a2f2973a70eac7fe8569da4b7a0b63/nedoso.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/q7anjemkqgl6s11a459kft29g8/tebebizutafajux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=aprilia+rs+125+workshop+manual+rotax+122+engine+repair+manualPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76F 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_01_sfnt_off0000d022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD022 25228 bytes
SHA-256: 04ca7e6db435f9b1bbf1ae8e2913916698402f03bd0d71f448db79d257c2542f
font_02_sfnt_off00010f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F82 16404 bytes
SHA-256: c4cc6ca0feb85f2e77e871ef97995756e69bee37108bc20fb2fa468bd98e3578
font_03_sfnt_off00012644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12644 11364 bytes
SHA-256: 7493bb6365f101bd5570875f745d6a2641863815bf31768adae79379f1b8f061
font_04_sfnt_off0001411c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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