Malicious PDF — malware analysis report

Static analysis result for SHA-256 578e5354457839b8…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 17:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e56d1505f32f9971d52d813c35ef2249 SHA-1: eb0743985fc2f9fdbdcfe4098dfabcf304c59715 SHA-256: 578e5354457839b8c8be516a82f62ff398d7f06ae799bc7504c7fdc6a0b69553
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 contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of a link farm on disposable hosting further supports this, as it's a common tactic to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614015d27e31a---21860145646.pdf In PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/77712302104.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/71141616380.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/powigozufixuxobopid.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/velis.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/16771326834.pdfIn PDF document text
    • https://insp.biz/img/file/11980548408.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/dujixusavuru.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141aaef8042f---wuzawukipadodipedi.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/60300935829.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fc7d25faa---93299887492.pdfIn PDF document text
    • http://jar-ted.pl/file/76727723780.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161426b3edfb7c---34813159811.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/49057196277.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/589027930.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/sevobivefuligub.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/29675231200.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/5683748207.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/923mrvg9adlqlsqdqe5a8kkm3s/31453546802.pdfIn PDF document text
    • http://apicn.net/upload/files/83990184519.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/relijaj.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/zabiretejo.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/93737739600.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/zajufo.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/1f551ea1adadddde81641a069897dd7d/30981271942.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/89889678419.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132290052a82---32751189238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=fall+guys+apk+originalPDF 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_off0000e39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39F 10480 bytes
SHA-256: 37998a5f1e81d04611e7feb694034aad8a59c802b0a7af9df6247199683851f7
font_01_sfnt_off0000fb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB80 18280 bytes
SHA-256: d004cea33f6d5caf3aab44bcdaf9c1ee119234de0ae2390da68bcf14b60f0b3a
font_02_sfnt_off00012a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1