Malicious PDF — malware analysis report

Static analysis result for SHA-256 b541c936248e2467…

MALICIOUS

PDF

85.2 KB Created: 2021-09-06 15:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b7db1177e86ab2344aae1e861931fb7 SHA-1: a9d30cfd320fd2056c56bd86acd14546856f4af4 SHA-256: b541c936248e2467253965458b6ef1a8ca4a998e1b9c611f988bd143a2415031
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting sites, indicative of a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a lure to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/unp999unhds8cvj7je1tuddvan/22244855830.pdf
    • https://bor-diing.com/upload/files/16331466466.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2682544953---wawatiwujupejipuluj.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160806844c7105---51216680874.pdf
    • http://doks-films.com/pcms/content/file/kazexaxujugawobimak.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160706288eadd9---favevanebelobetemuziwu.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161134589da8fc---53189380559.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2dbed7381247dab169e71c3dce29ba16/59061171085.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160806e271a25a---xokunana.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160779fad9b40c---ladevobolowaxirajajufa.pdf
    • https://ludifrance.fr/userfiles/file/85142714860.pdf
    • https://burlingame.com/wysiwygfiles/file/31587422344.pdf
    • http://namlongprojects.com/images/uploads/files/kininovirubuxofule.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607673e87f2e7---lewipegivubavebafabegig.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/q9lhddqurft6eue8jfh3c77ctc/96177745414.pdf
    • http://woods-china.cn/ci2/userfiles/files/20210716235438.pdf
    • http://indel.sk/userfiles/file/temalamasulijer.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/4e4a18513b55e20426e051671812d66e/88679508499.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=python+pillow+save+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e27c.bin
ed0f499af43c3b5e26216eb6a340c3fc7b474e838ae0145231babf4a40e65c84
pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 19988 bytes
font_01_sfnt_off0001167d.bin
721a42d59296c127bfdd84345159d2cf1905801421ab1c3f863f4f1327ae9bed
pdf-font-stream PDF embedded font (sfnt) at offset 0x1167D 10764 bytes
font_02_sfnt_off00012f4d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4D 16792 bytes