Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc98771dd8f698b7…

MALICIOUS

PDF

88.8 KB Created: 2021-07-14 05:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cf3ee85475b9fca70bd00400d248c18 SHA-1: 963ca868c2646229b57932c0e2cca8ec2a15d43b SHA-256: bc98771dd8f698b78bb2b3c3596faab5040092a72ce3869f2a6f1079cb60e5d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating an attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e76f93c018f---menigovalodotofomowunewer.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/t3440826ilcpcfb5nhihouukrh/62644068843.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a18c9e431ed---48964743704.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/5d1be8a41b7597e7134b422b6cbe335e/77686371253.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e406f60411---16424198211.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c8798744a1a15e3ca063a5dfb7fdd579/8873881719.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816cd905d1a---mudabowigopikojeduxasises.pdf
    • http://gekon.net/userfiles/file/69351554820.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc6ef7103e---pusesajifotis.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/4efa762101db425a2f92afd50981a302/65442152721.pdf
    • http://pierrevillers.fr/mairie_files/file/90972849713.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/6f00147e3125f056cfa9a6308878f5c9/1967454861.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f52fbad896.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9362c8c4d4---58795142009.pdf
    • http://snap-drone.com/userfiles/file/6330781624.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e877d9de139870acb905e5b17b1ad6fc/82776297938.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707d69a5384---75944085068.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/e0ae7dec2d539951489d07e3d9e24c21/92173672169.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/9tcmjvfkhtll17hbofdrfte2m4/32858464927.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ngpk4id78uh5a6ufrlmt5ga9q0/84320697701.pdf
    • http://www.salpasafarit.fi/tiedostot/files/78178471655.pdf
    • http://poexali.org/static/image/_u/system/files/26990066170.pdf
    • https://www.andreivieru.com/ckfinder/userfiles/files/9255403867.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=a+dish+best+served+cold+novel+chinese+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb5.bin
1bbdf90dcd536f11292a2909bebe4d8ca9a3ab9c266ead3194bbf0362eaaf0c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB5 10744 bytes
font_01_sfnt_off00010716.bin
37b06908812226deffd4a46e1c220c8d1eea1b5ce5510ec4693d6f1ef0e17b45
pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 1720 bytes
font_02_sfnt_off00010f4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4A 16792 bytes
font_03_sfnt_off0001275c.bin
9871cfe5015b2f8f4deae1b86102436b0ae8e58f001d31ff184f46bb0c852f31
pdf-font-stream PDF embedded font (sfnt) at offset 0x1275C 17672 bytes