Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4797f64cbdef5e…

MALICIOUS

PDF

72.5 KB Created: 2021-09-02 04:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dbae0edd406438fbc59f755332a2af39 SHA-1: 8531fcaa17133b9f9917a8bb1b53fa84df770e58 SHA-256: 7c4797f64cbdef5e0c2f9f2ae6946c6d2d84cdb6e15a8911ec8ffac74a15e3eb
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aep-tc.com/cache/fck_files/file/43383192491.pdf In PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/5betgh1opis2srcjhmit92nqvv/89048747790.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/94804928585.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/412a2d640e029e086a602b74368d934b/8683470935.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/7bbef862e6db39f327087a86243912c0/familadafu.pdfIn PDF document text
    • http://cke.hk/userfiles/64875819328.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/karamive.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/suwaluwakupa.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/25125817341.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ht9l2u7js0aekgj7vsavr8da4p/31510697433.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/mominekewubawimenub.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/57005230695.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/58469438957.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/duzepamujij.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d0c110c23---66406692118.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/38888425505.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16100ca5d0c797---7816951331.pdfIn PDF document text
    • http://lamdecal.com/Images_upload/files/fezudixavebifotat.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210805222400125823630.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/kumop.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080e5c2b6433---gitebaniv.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8e1cefb3d---luterajobeguler.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/pvdmmhqgstgckhldjs9ak0jjct/77042098443.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0a3fa2a6a---togomoputafamor.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/408e24c36fcb97bb8f4d3bb52a92da1c/visuvisezaderedebuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=minecraft+slow+motion+commandPDF 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_off0000ba27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23E 10716 bytes
SHA-256: b1d9502e4f87c77a902274a20a339ae8942a651d3db1b68f499222bb297bc0b9
font_02_sfnt_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 16368 bytes
SHA-256: dbf3ef8dee60fcf70995dd2568e125abb9c85acb1a113c47cc7a01fb9fcf3bf1