Malicious PDF — malware analysis report

Static analysis result for SHA-256 1391eac854ec53aa…

MALICIOUS

PDF

92.7 KB Created: 2021-06-28 03:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b76ecc6a9230a579b38bb36bfae23d5c SHA-1: 43d46666485c3cf4df57406d61ccf05602123dd7 SHA-256: 1391eac854ec53aaf874891ab06e5c9edd54f7ec35c7f3b11a0bf0e402212989
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to potentially compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and does not provide clear textual content, but the presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078652ccd434---21893718871.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8aa5c9c8dd---jubifa.pdf
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51446277993.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/e7e084ec6a2d1bbd4fd108956329727b/28784794164.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/05t7agn83e83trn9n69on5uha5/dugol.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/612602ea3dcd7df6eb0681e1795452f9/fivonomisiw.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/3gkdgile3a66bmcrlicnkphssb/29451550344.pdf
    • http://pincailight.com/zk/UploadFile/file/2021060915474273499.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7db7aaf960---31247907066.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/uc9hch0rkf00gq1adf4kjq3v80/dipemetedojiwaliru.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093eae064db8---43906737924.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b935d4f51c---buxudapokiporulifidaweliw.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b19aa1cea---42552484859.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/ladiruroxobur.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/4263f86fbccb1863a89e2ca8e8bd16ff/52814568081.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/956966842b90760e3e97dcaa9e041c9b/19187742141.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/acbedfe856d71281a06f32a6d76885e8/fugotemewo.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/04d12a491cd9ddc0833f65a14e392021/15296180472.pdf
    • http://szwygs.com/upload/mexuropeg.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78fec1f9ff---tagoza.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/755d2b626af903c36b98ca7e1fc8db53/4945542197.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfada007984---18006037837.pdf
    • http://hongshengfish.com/uploadfiles/20210521/210521221640355983ysgk8ogf3j4k.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fda+list+of+hand+sanitizers+to+avoid
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e8.bin
3c8dc98b64304b397b0cbad99489af2cf3021aaf05091fb43902c7577acaed6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E8 10552 bytes
font_01_sfnt_off0000fde5.bin
1467df8acfa1dae7b169a9caf3be5f16497d4a16fdb7f492d276ce5341570647		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE5 17392 bytes
font_02_sfnt_off00012b08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B08 16792 bytes
font_03_sfnt_off00014315.bin
09addeb75f39ef01c72f38ccb3b1c9f6bff4dbc821359ea601ab83b7620a7d65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14315 2252 bytes
font_04_sfnt_off00014d0e.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0E 16140 bytes

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