Malicious PDF — malware analysis report

Static analysis result for SHA-256 d46bbc58dad3368a…

MALICIOUS

PDF

85.8 KB Created: 2021-06-26 02:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e24b0eba85ecddd24dc2ca2f0ec7739a SHA-1: 376fbdf8a5873a40cc8e67663acf481bd1f8e6f3 SHA-256: d46bbc58dad3368ab125f4483a83d4e595e89bef980f6452d16b7a8725645b82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised WordPress installations. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true malicious infrastructure. The presence of external URIs and link farms strongly suggests this PDF is intended to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://queure.ru/uplcv?utm_term=best+time+to+view+leonid+meteor+shower PDF link annotation
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa53b675e4a---risoxiruv.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/32541762839.pdfIn PDF document text
    • http://learningkey.org/userfiles/41639055351.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/digirarixufuxezadoduziwud.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7c808c8da---16041215581.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af10df4a3d4---vuxofomasized.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/xixofesepo.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b0165380ae1dbdae904a44eceb9feb56/26922065291.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f9ca7e33---97929811741.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/61456845633.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d3af93830f5---98636272606.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/14809925204.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949d0a0f87a---pigosutobiduwotu.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ccb8a32a56b06758a317b74cdbd9c16d/maguraxemixuwirovarezegon.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/bb4e2de40a733da227a0806bf384bd28/3277219447.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/47f611839c96f8117b05794634168b0e/44696811906.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849b2757918---20789130939.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/518f1657f8c1f3d84c89a25d04184cca/78071932358.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/44689092029.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/4qkjg5c9rqor8mvpu9bl053gto/jivinuzevakusonorapu.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210618171827121185977.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/026a0564f54496299b2a7e1449792b85/luwewilutawak.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB9 16996 bytes
SHA-256: 8f0b01c7f3e85db6621a2c9ec716a977c70806f173d639433cd20cf5d6ecd4b5
font_01_sfnt_off0001182f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182F 10556 bytes
SHA-256: 569445fbf79dbe4c61dc56b04bc0956ddc7331d6914026cde095f10faff61b17
font_02_sfnt_off00013019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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