Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d419f7f85f63aa…

MALICIOUS

PDF

203.6 KB Created: 2021-07-31 16:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ccbc7c8765aa63355b7959529fdc77c4 SHA-1: 395ff8aa085aef484d464759796176e62adc7490 SHA-256: 05d419f7f85f63aa7bef6cff2c8adfca445ef113992134cbe6ae1721ec7090df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing attempt. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute further malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristic firings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 5

  • 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.
  • 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.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073aefeb303b---43072812926.pdf In PDF document text
    • http://avonsteel.com/UserFiles/file/vulavedepakebu.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/83088244293.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/89703006788.pdfIn PDF document text
    • http://thehonourride.com/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/26147998960.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/18985186989.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e248333bd---86345224955.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/132997969.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/suvelinij.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/54799836320.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/verexevesidividenusobaz.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0286c03b4d---bugoxodunidowowomukosix.pdfIn PDF document text
    • https://dm288.com/slicice/file/tisaminirevalanu.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0272445001619917955.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f388c25de89---dopegavetozep.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a31d3799810---66076120577.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/sidibakadakug.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/dimavegokoriworidojus.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/35366237647.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/cn2gjugtggv3s6gc4dtgrrab7p/68527083802.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ff2qddcr2f5vjsr8k7hlg3472g/98595380198.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3f938f99b---48077804727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=roles+rights+and+responsibilities+of+citizens+worksheet+answersPDF 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_off0002be1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BE1A 11324 bytes
SHA-256: f6ce9de76d84e1128224b2bd25df556025f0a451692be64accb4708aae0a20ac
font_01_sfnt_off0002d85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D85B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F06D 17892 bytes
SHA-256: b795a1fd3f0840d5ee2bed8e7e7d0a09ac01598d96ea8e11f9f95ead3e9ca3c2