Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb623d429b3054f…

MALICIOUS

PDF

75.2 KB Created: 2021-09-08 10:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a5f250d603633910aebac6187a6fe4de SHA-1: 0f2d876d18858b221ca27bfaae097190820b02c1 SHA-256: 9eb623d429b3054f6dab6f0c4755afde2fc00a9f77a9b1e247b3f48aa9d8e2af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the extensive use of external links is the primary attack vector.

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://inwebjor.ru/uplcv?utm_term=vax+blade+ultra+tbt3v1p2+manual PDF link annotation
    • http://www.cerathai.com/image/upload/File/filuwevesafusem.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/80715602241.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/98873652730.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/80190321355.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094da8603c5f---70383084552.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/63350278559.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086254ce12ce---xupafafimekugimupofolase.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/kuac5a6atqj8mm4147qd918o22/vilulidizesenu.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/kuliduxowisumubekuguwolev.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/rivubavarilixopideluva.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6ceb9aa16195a87ef655398e99835b29/fulogi.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/77434005742.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/38332165452.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/nh7rv72lth0scifp27oto24rd5/59527078264.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/77214881111.pdfIn PDF document text
    • http://maihome.hu/admin1/file/farasafojib.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/lajerabujixulijadojijev.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/52102025259.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/tovufobepotimom.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad64b9ca868---zawigu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/41823803211.pdfIn PDF document text
    • http://sieuthibds.net/images/files/libotatek.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/pofotorozunivofagi.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/nebubusoba.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4ca7cfff3---gukilotetiw.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-8-1/20210801051440129797.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_off0000c2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C8 10892 bytes
SHA-256: 8b06f1f1b96f401554cc2b545e94dcb75ceafd503d18cade61427ef10b61d3d0
font_01_sfnt_off0000dbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F3 16772 bytes
SHA-256: ddb4a43ed168d02db405a089c5647d23611ab0362a022c1b8ddde0b9c2b554e4