Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc984bad18fa97f6…

MALICIOUS

PDF

106.7 KB Created: 2021-09-23 21:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c71e23e41343a8af6d3a752379515646 SHA-1: d626c82d2a354788493cc0e487860d2b965a4172 SHA-256: dc984bad18fa97f638b10508cc37f40da6083eb231123301d768708060f762cf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farms points towards an attempt to lure users to download or interact with malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://zeshengtecphar.com/UploadFiles/FCKeditor/20210911004712.pdf In PDF document text
    • http://ateliergermain.club/sites/default/files/file/kamibasopaxawolafaga.pdfIn PDF document text
    • https://etimes.mn/uploads/files/veradisotojubibufal.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/96425224296.pdfIn PDF document text
    • http://dfanchem.com/upload/files/45941820208.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/danikiponoxugajunisazadi.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/45728821188.pdfIn PDF document text
    • http://profstil.az/userfiles/file/82209281353.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/wukiwexezejedibi.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/gufobepufokufigigajaji.pdfIn PDF document text
    • http://leeandrewdavison.com/download/28034754715.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/tujuvixezajibusixubetu.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/74319705062.pdfIn PDF document text
    • https://sanidom.pl/img/file/16925313201.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/mogobufepolakivitux.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/96906103486.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/65730abce640d2fcd55c9bd910f846d1/20313526267.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/wedofikoxanuridazejapud.pdfIn PDF document text
    • http://telektrans.hu/editor_up/10236856877.pdfIn PDF document text
    • http://cissi.it/userfiles/files/87217849603.pdfIn PDF document text
    • https://www.cygnusdvlp.in/nitdurgapur/uploads/editorUploads/userfiles/files/88122726329.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/rbqvnsbr92ei5cfi5svpm2rtd1/palivizigog.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/43035213398.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16139f525d5369---ginewirovapajib.pdfIn PDF document text
    • https://motoralbini.it/files/file/57643632629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=toon+anime+apk+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5A 10328 bytes
SHA-256: 9baa15b328df8c640da9f5646de06e0f287999cdef4750ca76fc6ffd05fcd1da
font_02_sfnt_off0001449d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449D 24676 bytes
SHA-256: 0deca59fe749a50e2c12d8936dc9d1b0d7910a9ade27cdd2c403dbaef20446da
font_03_sfnt_off00018461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18461 16828 bytes
SHA-256: 07365fa96d8289c25dbbac992125932f95ad99b4d99795a04fbbd4483b7908df

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