Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8df0411d7d3b487…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 07:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b7a0d5219f6b2082537634f41a48e17 SHA-1: 68e49fb2b653f1c2acbc6179441e75ddaa818d9b SHA-256: e8df0411d7d3b4875d2141f813bf9bcae3566e56e8ce34113809fd5f59e60fdb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://nomylo.ru/uplcv?utm_term=numeros+reales+concepto+pdf PDF link annotation
    • http://nadiadsa.org/userfiles/file/90431405910.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/3312f35730239be010af52d757c8f9b1/tesonoweni.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8928bb533b---veleruwup.pdfIn PDF document text
    • https://bataretak.com/img/files/file/jamoxixab.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/butekowu.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/lekodelumupemijirave.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/98779671855.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/jjgscijh6e1gk3f7pt7819ds4k/36218907286.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/2a33a7d89ee9476df0c43c62b64ccfeb/20249726820.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/letebubagabuxab.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/gakip.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210702025136.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/626a30b51f5c0a4e7ee06fdcc2a7fa7d/jikup.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/eovha30ashu59ebs7nfgvln072/61416356261.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/8202014468.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/61218182984.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/jufokalisoralosogo.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/svereh4csospvf3boprf07lbr0/98848622062.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/15d2a6dc5563b000a0e37d6007538d6e/56980102780.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/b06309b46c2e677f5396cc9ea24754f1/dadexujitisiwudubam.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/nuwetitet.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/karezenajipaxuzepubawe.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/68314486221.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607f091868997---ladajugen.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_off0000deb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB9 10764 bytes
SHA-256: af124c256df25419b23fcdae97856b35541f95dce31544cce6099e1913f6c185
font_01_sfnt_off0000f783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF783 19440 bytes
SHA-256: 5c3fe42f6bf026d5c503bfbc457b0b2662a3755da4a19af11f7276e7a1275146
font_02_sfnt_off0001287d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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