Malicious PDF — malware analysis report

Static analysis result for SHA-256 507d2b9a08470ea3…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 08:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3ad05fa0fd2c81dfb60f453eed54e958 SHA-1: 65d24879a2de4183b921d104af0227a0b2c51249 SHA-256: 507d2b9a08470ea34de7be5f1aca23d7c992d981322d86ed52720ed7ccd25095
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The presence of external URIs and the ML classification strongly suggest an intent to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://maurovalleferroarchitetto.eu/userfiles/files/netetizudajimelegas.pdf In PDF document text
    • http://letnipohar.cz/upload/file/7751603209.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/murunetiwakejapegavox.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/2269317582.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/8e29ddb4b02c8360c478ce1accdb5377/gobozulu.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31724247495.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/82914084955.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/begubigip.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/94717296184.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/lixavigigijoxitilesat.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/juwesevovonesez.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311d5eae358---10845645820.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613820303bfab---vazilimuruwajezetad.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/96499961719.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/24717412553.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/38997112581.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/gesifovibinu.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/lazod.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/48115221135.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/litesoxilunesifodudike.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/nepumufelutufojigenu.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/lekuk.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210918_011729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=apk+extractor+pro+apkPDF 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://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_off0000e0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 16972 bytes
SHA-256: 76e12c362229b873e7f79638f42ba19f864e1d807f988aca22b0529e6e41de55
font_02_sfnt_off0001246f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246F 10132 bytes
SHA-256: fca41a21849d73ef357b26840b9beaa10f88a7f7550f8a5f1c9fa71d4c7d8eb8