Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8d7380c403c8f8…

MALICIOUS

PDF

79.7 KB Created: 2021-09-08 14:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 37df82ae2d67c9b4161578b9bff55ed3 SHA-1: 3800f83124d5f0d221d1cbb02a32217de26803cf SHA-256: ff8d7380c403c8f806873c2a6fc9a98331f9fab32f6a6fb96c533c70d7d8d2eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these external links. The presence of embedded JavaScript further supports the possibility of exploiting PDF vulnerabilities or executing malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=skalarprodukt+vektorprodukt+pdf PDF link annotation
    • https://otterdisplay.com/userfiles/file/samudores.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///saretuvemogir.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/84870376511.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/34849224101.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/77591087443.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/86942558777.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/pipidagux.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/vonenabekugavudal.pdfIn PDF document text
    • http://canadianrockies.info/files/file/98784059658.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/nofawebukovoju.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f2d99b866---sowavejixa.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/79455592968.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/vaboxifetowivabojal.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/57868066613.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/44643409702.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/02de1276130b6f87d9b4da3a128b33b4/33654998325.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc5c4e0316---90163233069.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/75033259707.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/13023028413.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/kirupawitidusoxejowaj.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/36864920888.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202196025412101.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/kikinowewojidaxabaned.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_off0000ce4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4E 19616 bytes
SHA-256: a12a3ebcdba9c5b4e38262455037dc81860cb6aae94bb7279ef08cfaca796be5
font_01_sfnt_off0001016d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016D 10460 bytes
SHA-256: 2378a3c3cf14be05739cc0bb4895cf6e4ec4dc76e17fea6e9c763cf145867ab0
font_02_sfnt_off0001195f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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