Malicious PDF — malware analysis report

Static analysis result for SHA-256 26cfbc77ba566974…

MALICIOUS

PDF

82.0 KB Created: 2021-08-21 09:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eefb87cf83c002066cb5b0ad76aa59a2 SHA-1: 77c2549af209cc98c510009642b6a8477509dd13 SHA-256: 26cfbc77ba566974debd26c6e89ae3bde76c86e849742c2acd4a7e7a420b4c4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://smidgel.ru/uplcv?utm_term=sullivan+and+decker+effective+leadership+and+management+in+nursing PDF link annotation
    • http://megat.pl/uploaded/fck_files/file/12589391325.pdfIn PDF document text
    • http://healthywithhart.com/res/file/51631378007.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/2b479e9986c49c5f23570258858b6aa0/bulobimeviralefajuvafid.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/99tnqccau5pohb71ljtiao73gt/rekoxotul.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7522d1e38---3555290593.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ec87e0d7b90967ac3f916e96a04e97a1/zapupedotogurinibizuzu.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/98224253757.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/cb49a26c0caaa26c0c16105d4b07bd1e/12799784335.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608af2d48da15---47868724129.pdfIn PDF document text
    • https://actor-conseil.com/files/file/56024075417.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/70475766712.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e13decddf---mudofopokelukoboxo.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789987331f3---fixosew.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/q9qs73uhtah5unjek53bkdsg06/kavonu.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0eb8dbf39---xanevegobavenoregome.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/33060066787.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/rujivurujutatili.pdfIn PDF document text
    • http://licausi.it/userfiles/files/74649768899.pdfIn PDF document text
    • https://bem-sa.com/img/file/90661553838.pdfIn PDF document text
    • http://udemadriatic.com/userfiles/files/xukizoz.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/60d957a51696e73d8a9a13b624cdd261/zimulunerirejukifobupe.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/lejupoxutamujitaralo.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/46200750209.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_off0000dc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC66 11280 bytes
SHA-256: 77a6aa754d2b1885ce18b102003a60a6ee6bb535e63064fec4554ab4ef382242
font_01_sfnt_off0000f677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 16600 bytes
SHA-256: f93d5163166bde01805db741918961eea323a75c589360926c269c26bac297c1
font_02_sfnt_off0001216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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