Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79d252a69260f27…

MALICIOUS

PDF

88.1 KB Created: 2021-10-05 18:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ed60e86e0c2aadeb0613ae9da8a10498 SHA-1: 20f53cd47ef65d9adf5575c8a90c0f34bc0be410 SHA-256: c79d252a69260f27ef5d5ba37f7c6b5d6691a60529b2426bdab590d0adfad819
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous external links were found, with several pointing to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cachnhietwin.com/luutru/files/64409666449.pdf In PDF document text
    • http://k-ookuma.com/js/upload/files/75277971739.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/jamugokepovet.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135be8f1dd94---54916831989.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/jumezigurojefapiju.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/12502823203.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/97262770464.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/8907ff931e26c4e1789f3f33620e4eb0/tawuponetalirekobosiwilu.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/dubofijotixutataz.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/9853337304.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/79390832728.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/93194693895.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410787b8e7c---bulagizo.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/47481032184.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/37027108378.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/cf8477495cb13b41d8b46e180cf1699c/65966979952.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161588987e725a---11631179248.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614463cb40e4d---25682701025.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156ffa270224---runolewelamir.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/gexogolew.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/xiniriginuruji.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/87554542904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=what+does+you+reap+what+you+sow+meanPDF 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_off0000ee2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10644 10812 bytes
SHA-256: 8b30744725356932297b470b42f7615dce1f5ed9ad20250b8e38e14a6a15e665
font_02_sfnt_off00011f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1E 19816 bytes
SHA-256: 35919bb90defe3ec85f338e2e6a0fe16a9361d43fa89ec2bce4f45780530e560

Open this report in the interactive analyzer, or submit your own file for analysis.