Malicious PDF — malware analysis report

Static analysis result for SHA-256 979c2e768a037993…

MALICIOUS

PDF

83.4 KB Created: 2021-06-25 20:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2521dd33aae082bfb0eac2542eff10f9 SHA-1: e17dde4d067b20b33df335e8a3b1986144a017a7 SHA-256: 979c2e768a03799339dca2d9c7d38a1dc6fb192a1f98b04f8beda0f0d2d6cb1b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and disposable hosting. These links likely serve as lures for phishing or to distribute further malware. No scripts were extracted, but the structure and URL patterns strongly suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/cf8234d64cb9b0bf92cec5769cf4fce8/pogizid.pdf In PDF document text
    • http://elitaliaweb.it/upload/file/nexazilubotuxesolatesax.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/cvdhs7vbjsf7b9c1h87n0r93mr/juxifitagopewar.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c3d6f9387133e6cc3ca3aea81214a6fc/zesekeragifebamapowot.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080291553f2c---36580582027.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/bafowaxotativiju.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/38850baa91871cfcae48829874c89abd/fakilubo.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c17c9e852---vuwurazozekape.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4udl94q0brji38prp2um335tf9/8387807785.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/5c4524d1120083a961373982df84ce7a/tokaxazipijisesek.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/18964892342.pdfIn PDF document text
    • http://jar-ted.pl/file/28523150781.pdfIn PDF document text
    • http://momsystem.ru/public/file/rerupe.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/munilukurojigezedalijisuk.pdfIn PDF document text
    • http://temple.mo/userfiles/file/28485966758.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed35ff3a15---36932167886.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/1a45903a54ff39815bdcf5b97b01b674/37252919461.pdfIn PDF document text
    • http://ipublicity.cz/data/file/28173636367.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d9459df1a---vewujarebimaguxix.pdfIn PDF document text
    • http://intergeored.com/upload/File/modud.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d1e164b05---14332380330.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/24133423687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=winning+attitude+in+the+biblePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE04 16736 bytes
SHA-256: 44a48c3e23650b11a44ccdf1aed258b402236f3da4209eec43192c702f91913f
font_02_sfnt_off0001299b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299B 10372 bytes
SHA-256: 86b921749f521a845448b09d1a3b24c9462917f5570fc0eb9c215bffdb8b426d

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