Malicious PDF — malware analysis report

Static analysis result for SHA-256 8872bbc62414efca…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 13:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 08ff1eca14ffadf0766202bc34fd61f2 SHA-1: a977e86ee5f9756db34d98de2b6f0c5083db9c66 SHA-256: 8872bbc62414efcad5da87195f05bb4c80e7ae148325f539ca5c1167c64a3f2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=emuladores+en+android PDF link annotation
    • http://dianacb.cz/userfiles/file/ledemuzetaboti.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/turimojurojejinemodakad.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/dizuture.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/79112385325.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091715532973499.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612f7d77b9a1c---47855215714.pdfIn PDF document text
    • http://htwy.com/upload/file/84741407644.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396b8ad5e37---24999893514.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/23341893328.pdfIn PDF document text
    • https://alpinashop.bg/files/56690775088.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/pupilewijimebelukatexav.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/saxagok.pdfIn PDF document text
    • http://rsentco.com/upload/file/jutagijopotiwubujodadevi.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/83788060594.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/72473136247.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/rosix.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/41085860288.pdfIn PDF document text
    • http://rideco.hu/upload/file/zevupazos.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/finofiwuviro.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8i3ub5v9cct3mg9sln50887i70/beriv.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/82946329674.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/39306960185.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/tedatugetoridufixi.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_off0000da2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2B 10396 bytes
SHA-256: fcfd3dfaf8a65ad989ca550fccf2f24f843daebe1ae41b483df4b14650a4f1ca
font_01_sfnt_off0000f18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 18596 bytes
SHA-256: a141e0d3b977cf75bfe86a0829a8d6fb3058b583f0dc6985d7e06241e96ec505