Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6954fa1ea18569…

MALICIOUS

PDF

86.1 KB Created: 2021-09-04 23:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5f61e462e906219b62d4dc848a25e9c9 SHA-1: 24602a5a5956d8685458188890d7b53260a2aba2 SHA-256: bb6954fa1ea18569aa549c84938606c88f11343082365bcb694f1e314c4bcba8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites, suggesting an attempt to redirect users to phishing or malware distribution sites. The presence of external URIs and link farms indicates a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://catamma.ru/uplcv?utm_term=b.ed+lesson+plan+for+mathematics+in+english+pdf PDF link annotation
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ed900c42a7daa425c1a3e34fd9fc6fc0/69835307711.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210822_6092742EA68F73E7.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/wivuzudarobujuxopexima.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/nabolakamalexonugekuxap.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/981fc0e5febc9e150f448034c765e0b4/donanaripudeduroraxeni.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/7708391675.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/darafovunenumanaju.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/sexuwapuxupemikugovipegir.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/51984359797.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079629f4d2ef---60687613678.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d821954e49a31c79312c800c7e018269/bonuguwigujakawibodi.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b644f1c5fcf---potejinoxufobixada.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/femugovetomivewonana.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b86d99209d5---noxiropinirewuwetutoki.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/71772210212.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/lv2m9rdu3dme5emql839g0gvus/sotusunav.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd4277c7a3---pugaku.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836502a7fda---47666768809.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/52195877516.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161115fc3df19d---gidutit.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/983b360877a8f9dc24218eca9899095f/1982754462.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b574eca158f---15713054338.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160989e614652e---gikibazoxefajonoganu.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_off0000eb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 11188 bytes
SHA-256: 7a790e5aac80da295bfe7ece6427be58a6c950f614569e8aa285adf151d7b881
font_01_sfnt_off00010531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 17620 bytes
SHA-256: 8ffa9c37f346d9103d3473b359631fe50a13faf6b170a18029ed0b8c66c218c9
font_02_sfnt_off00013295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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