Malicious PDF — malware analysis report

Static analysis result for SHA-256 5deff7a422de10e5…

MALICIOUS

PDF

88.9 KB Created: 2021-07-05 11:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50495b9599bfbdfb0ed8866c917df2e5 SHA-1: 71b2ee4e1b50924038f3d3a456c8a25be83bda22 SHA-256: 5deff7a422de10e5df7875a46a0963817a18d41d501809bb0a9673abe1deec65
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites that host further PDF files. These secondary PDFs are likely designed to lure users into phishing scams or to download additional malware, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc23826ce0---85748882684.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745617b7a29---42550739734.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/m1mv27tbp92i2iq832oqlkel2f/16409530866.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dacd7fd10---karetowajudegalilejenut.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/gvmfk69ee1qavagdoslqnq7ee0/36773253414.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/c8e5d051ba5196a62ac5c5e90df611a4/64856906453.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf991ccba09---mafozefitixoj.pdf
    • https://condominiovillage.com/userfiles/file/tateroxubune.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a177b4206a---dewasisaman.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/02oog4u2rvqi9ck8g427rlnii1/42447328513.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608764bf73222---24721532592.pdf
    • http://easyreturn.store/userfiles/file/57377200536.pdf
    • https://bd-sokolovska.eu/userfiles/file/gamikobo.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/5ea399faf671c5dfc17cf9cc68873072/robolawopigo.pdf
    • http://batiment-tunisie.com/userfiles/file/vaxego.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10945fc4b---25191945012.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/jamshn977e6d7krg90ud575q5c/38670378946.pdf
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/bulukejeparex.pdf
    • https://petala.gr/userfiles/file/84777605025.pdf
    • http://marketherballize.com/ckfinder/userfiles/files/zanesusomebu.pdf
    • http://traiteur-ribot.fr/userfiles/file/64645045410.pdf
    • http://xpressup.com/userfiles/file/13395777576.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086c062b2350---wetuwatuvemijuvovesokud.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=biosorption+of+heavy+metals+by+bacteria+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_off0000f75f.bin
8cc050e92ffa45462abbfffd2663789d6dc6e1d9bd0dd7b09b934f2f175e559a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 17360 bytes
font_01_sfnt_off00012413.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12413 16792 bytes
font_02_sfnt_off00013c2a.bin
3909e21e0d6a619d0f2a874a65926053e0ca831a8be987cab63f9d8cfed52d96
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2A 11256 bytes