Malicious PDF — malware analysis report

Static analysis result for SHA-256 586419fd2e6fe4d2…

MALICIOUS

PDF

105.4 KB Created: 2021-08-12 12:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0fc133e9470a789f58ffa38056730521 SHA-1: e8acd8a2a8c5ea97307b61d8e0b8f54e5156acc0 SHA-256: 586419fd2e6fe4d21fa9b5149d07142aa6567e558ebd0ccaf7933bf4ab0607da
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://infrive.ru/uplcv?utm_term=what+is+the+best+hashtags+for+tiktok PDF link annotation
    • http://vejwun.cz/images/vegabupenigufe.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/sarekiwab.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/97862340309.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/lopironeronevu.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/oc4l3mn2bk06a5et0k6i40i72l/40493257096.pdfIn PDF document text
    • http://fittbike.hu/files/file/votirovibawi.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/2021719145250.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a81bf85bfd---nokagojajibozisater.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/2j419590uhkcoij5eb4doc6iee/sujaxuzajejedamime.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210715224947666127nictig.pdfIn PDF document text
    • http://dhf-china.com/d/files/90747569510.pdfIn PDF document text
    • http://akssert.com/userfiles/files/19847612720.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/tiwoxeriwites.pdfIn PDF document text
    • http://allycatering.com/userfiles/soxez.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/zasapabiwomomov.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/39668118447.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/29087919219.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079824a17e9f---xusibudab.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/8voior7lat6uvvf6q1nq09nim2/feseziduburazajabodigabi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/iu6364o26sdmr94llunraq51th/26351176443.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/vuzusobijobesan.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ded1c079c58fcd54e639a371413c33ec/xopeturiwuloni.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8d4hsilj6la5qg88lm381kdgvi/wuxodobakidaruwadonavug.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/saxidezuvelefinagowad.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_off00011eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAE 17700 bytes
SHA-256: ae7e12a0b70e4ab67c78b063d6bb1596e9609f2b29006e85f8f8ea7145d56c81
font_01_sfnt_off00014d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16559 10568 bytes
SHA-256: dcc64b525f39d7997a9aee7e6ad6de8f9fc99424c1ca8f7943e15916cc4a0a31
font_03_sfnt_off00017da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DA6 17020 bytes
SHA-256: eb4cb3ce9ec3f593c4d0ef28acbc42c5c7cee545ea8c2e55767e9f4e863ad776

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