Malicious PDF — malware analysis report

Static analysis result for SHA-256 449a4edb6f1ee6bf…

MALICIOUS

PDF

88.5 KB Created: 2021-07-02 09:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 403b791d9a84d135de8051a96b76f8ee SHA-1: 3faa4769f31a9d6397e032e9dec8ef1d2842ccb9 SHA-256: 449a4edb6f1ee6bfeeecfdb1f05ba45609ce0bda3d0576a9525bb083919b64db
126 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely lead to further malicious content or phishing pages, aiming to deceive users into clicking them.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3528

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://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908ee3b6215---84847913062.pdf In PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e33a2042d9---wepujovugerogosa.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/5160991890.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/t0dnugnp5856qg020kaptbbpkt/revisivefuvizofividus.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/sonimaxox.pdfIn PDF document text
    • https://xistenze.com/files/files/26325535395.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc33b4e251e---77285788241.pdfIn PDF document text
    • http://beiks.info/public/file/79073047301.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/66f3a26bd8e6572c2d6ac6a823f92eb5/sirekorosi.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160959d63d4a3c---59771101208.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078e7de70331---gumubas.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/vodojiwixagufoviniminawax.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/23231229792.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/42076290574.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/fepofigegomejebirudoxasun.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073db0f91a15---butuzimidekazifud.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9b1f07bf3---bodaxabawabu.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/29794947008.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a442fba9a1---gegipikukosi.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/semaveveruduvujujodidureg.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/2bhk2737gp8helmvqnld20ijig/72071536822.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/82b00e1de04d7dbfd9b265154894a0ca/40949639544.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/99346093568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=heroic+age+anime+reviewPDF link annotation
    • 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_off0000fff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 16980 bytes
SHA-256: b381d9867cb5d27f8178f1d7a3ee959c2cebcdd411bb1f4496c23dd1f8f7f9aa
font_01_sfnt_off00012c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C13 10404 bytes
SHA-256: 74d4b155dadd9267ce3db20f11d90466b02b4141b5a8c4e76a8b8ef5fb7bc1c2
font_02_sfnt_off00014397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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