Malicious PDF — malware analysis report

Static analysis result for SHA-256 75302bebba3185a5…

MALICIOUS

PDF

87.3 KB Created: 2021-06-26 11:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1a14ac828ddbf27a30a89f3bfa6ab591 SHA-1: f20d76ff97f5db707499c326aa8f37b124061f87 SHA-256: 75302bebba3185a5cb9cb452aa088a9c7a4c723e84a5a719d5bc29e49b38636f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm, likely to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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=erosion+earth+science PDF link annotation
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609be10ecbda3---83551730579.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/90858052265.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/rivugarizosirimulem.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/d097a41ff49e3c8736518243313f535e/74618259385.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a032449ff---77210606104.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/gofewubowadunew.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3734fbd2---47266998046.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/3883290102.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/7ad2ca50a9197915c863a15441c9eff9/5626225985.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072682b4aa00---newimebupu.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/75277438956.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/13396468180.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/86a79818abe11ebfca94018ed55359a1/12889112170.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/4ffac0441036316baff2780ec147441e/zezavisolezijeliz.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c5140f763---32291920628.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/ad56d0058cd7b014d1158a943d710583/mirajozasakolifotegise.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725cd291b49---potesibuguzisexaposenoluj.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/47c73566532b2d6bd19a5b335701a19c/81694472829.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/fozixifopokexubimixep.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/23435166322.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/7ba20de9458267513864afaf8f5f2712/mebubositobefuloxebera.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073854bcfb5e---44376461242.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/rixoxapi.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/3162e0032435046bee1d178806cb755e/boraxalopikumor.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC14 10264 bytes
SHA-256: bd43405e9a69014a6459c74831da428a7e1467779334972a2182e08ebf4ccbd5
font_01_sfnt_off0000f318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 16460 bytes
SHA-256: 128991f5c1439f1e60f0d9765295b5ad66d1b063a9a2765b31b3552cb36eea64
font_02_sfnt_off00010963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10963 17164 bytes
SHA-256: b4ea94a3c704c26fd9fd6440ee2133cc308f84ef0c980ea29beeb1484375a83f
font_03_sfnt_off00013636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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