Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e05f69dd702bce…

MALICIOUS

PDF

113.2 KB Created: 2021-06-18 12:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b4f6eb5c53ced3443611edca84055e17 SHA-1: b635303199929ffd161a91711f562f732e66bb86 SHA-256: 08e05f69dd702bcef69c0d8d725d930ca1eaf184e0af1e8ef69d9a8c40a569f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f580e9d5a5---60530233408.pdf In PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/829d5e5ae5a686476dcb9110a8f52667/25535656345.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773bd379e76---batefevixov.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/kumozuzefidofemefaje.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7e07fae1b18d6001820abe9f589f82bf/96816338553.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/gakofujupinumovez.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file/%5C/2021060219284888.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/dg8uhrm07eog3i8349vg8sa2lr/kulisizavidep.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/84900564821.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073aa6873676---koworikibojaxivabew.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/bfbbed37de1d2fce9147464170ceee6c/xaxufitaxamofulenonazew.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/921afe759f76b8a6d8593ed694367f8b/69161118694.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609e634360017---tazeziteladofaremege.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a14a415dc19---tidivajatemojiz.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/sm5i6el5psre8e22hgjjmoiqd6/lonisusaratijiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tuesdays+with+morrie+aphorisms+with+page+numbersPDF link annotation
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17029 5508 bytes
SHA-256: b6eaeeef3a6896e0af7f7dd1653fe63cbea7d62f488297359c947a858b544a88
font_01_sfnt_off000182c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182C8 10760 bytes
SHA-256: c92f84e035111293b0d4977f81a4b15a58f43ab009a4e1f937ac017f74afe2b3
font_02_sfnt_off0001a70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A70D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34