Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be0ec749bb7999c…

MALICIOUS

PDF

84.1 KB Created: 2021-08-01 23:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b7ade5d3342568e8023c511380daaddc SHA-1: 8413c79a34b96206f33fb8499d40cc232867ca95 SHA-256: 3be0ec749bb7999c5e8d2a5e28eeb1dfe0096be467d2d0ddbd54cd10b2b2795c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, pointing to multiple domains, some of which are hosted on compromised CMS uploads. This suggests an attempt to distribute malicious content or phish users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://spreewaldatelier.de/img/editor/file/48363624277.pdf In PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/03e8d7f55b202409a698553cbcd26d7e/rakuvavelepomaxepa.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/90255875696.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/gamufis.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/58506679324.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a508187854---xurukidivedupalaga.pdfIn PDF document text
    • http://vswet.ru/f/xebebowixojamaredo.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/natusaw.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/7544450116.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/mevamuzuxolegazusaw.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/80838706599.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/rimamagexazono.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/3gos6srvm6roqoe401e4c2k43t/20694284473.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/32938970016.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/12019390212.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b45bcedefd8---41275239420.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/vegakon.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/lorezimixukuw.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/sofaluporutekomosiwaj.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/34374132328.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/murukako.pdfIn PDF document text
    • http://unsersohn.ch/images/file/dolukifezizuvapig.pdfIn PDF document text
    • https://whitesal.com/data/images/file/8046_20210714125514.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/lagosometiwelejetogabal.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dabae6778---zavalinekugotud.pdfIn PDF document text
    • https://strechybenesov.cz/content/18990634189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+much+air+pressure+in+rear+air+bagsPDF 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_off0000e46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46D 16876 bytes
SHA-256: 5f85322cce056f49b1a91ff9a57788e0827e63df7b110dbf578c92d23fa9b258
font_01_sfnt_off0001108f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108F 10996 bytes
SHA-256: 3ecc5bbb42105296e437b1314d0a565aeba6fafe101e0572a23d1f2a6d240434
font_02_sfnt_off000129b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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