Malicious PDF — malware analysis report

Static analysis result for SHA-256 2faffc91e152cfc6…

MALICIOUS

PDF

77.9 KB Created: 2021-09-20 16:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 63d3110046f84960dccb5b67f16069f2 SHA-1: 500da279252e6a477410dd74e9b1221028723626 SHA-256: 2faffc91e152cfc6bdabad3377db4b5628d3e8cee0b99b971d513548192ba007
156 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing or scamming operations. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://www.gamylai.vn/uploads/files/pirefiwadagenej.pdf In PDF document text
    • http://space-edge.com/upload/files/xumuj.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/zumopegigiduvawesidimi.pdfIn PDF document text
    • https://506hlapeta.com/files/file/97218682158.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/14901727564.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/69838860368.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614855db4ac3f---timivowalemefavekiga.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/78623609488.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/latodojutakuxexebunuri.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/momugipi.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/zurirobutupebi.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/fedojubulodo.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///ribepawovonawaxasuk.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/50428952491.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/8888114672.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/56921810613.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/67348156009.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613513c982674---zavonusexujo.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140eb6fc3c65---80677243801.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210907042150.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210906_5AAF2F3BD4C2956C.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab1b7b8553---fofoxifukexe.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/mupafujesepuwigu.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/xasowopiboku.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cb2b4d8a7---8794312567.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/xadiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=justice+league+crisis+on+two+earths+onlinePDF 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_off0000c9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D7 18384 bytes
SHA-256: 182858436c2a6882056009823c68e6193e098eaec9887b263ae8ad288ef23929
font_01_sfnt_off0000f924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 10684 bytes
SHA-256: 867a6cb1e59c14e00d4a3d5159c32e2dccc91d45f40ad07b54b246c25c6b9b49
font_02_sfnt_off000111b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1