Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fcbb72efcfe6f6b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 18:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 11f723f81617c98d194eb6443e79492f SHA-1: 6d65ec15948c0c04f05a3cb26c41dae33efa5503 SHA-256: 2fcbb72efcfe6f6b006946dbdaba1f6fbaeec65c9b6605c2684563f907d2bcff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://marsalanoleggio.it/userfiles/files/defiwapikefaluw.pdf In PDF document text
    • http://aaaexpressheating.com/userfiles/file/vebufuwusovo.pdfIn PDF document text
    • https://soechi.id/userfiles/file/komunigomasodifimebotanek.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/lejoropujobu.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e96a7749c000e86930acbf9ec896602c/wozuto.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/06e77le01fb9uct9vblm1fckrp/66133762107.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161217f692b9ba---70271052699.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/vuzutijoj.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/42539367867.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ff0dfdafdd3---gulakipubexokak.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/58668967983.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/88351577621.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999ca09d7b9---12616693955.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/qehfv5fi7b53jj7u7ef1rmgi8f/56526146536.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/wewalabozo.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/lepokoderonen.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/778d1a1a5e27a2aec2828baf7ffec185/wasobejar.pdfIn PDF document text
    • https://europartner2.pl/uploads/noxivini.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/75980431554.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/mobalejemipamajuvefa.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/0d5beda7e265c6abb9882dee3bfebbca/37353222859.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/xuludokepiw.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/taripojemebe.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/87182020076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=fourth+grade+math+skills+worksheetsPDF 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_off0000dc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4C 10848 bytes
SHA-256: 7f5060a569b99d8bdfe5d225246beb333893c7a5685e68174be65c4495c70308
font_01_sfnt_off0000f535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF535 17956 bytes
SHA-256: b60d3df69e0cd824a0a1050cf407207b62debaf86ee700186d1b8b5f25e76e5b
font_02_sfnt_off000122af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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