Malicious PDF — malware analysis report

Static analysis result for SHA-256 6109153d48cced88…

MALICIOUS

PDF

84.9 KB Created: 2021-09-13 10:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fc6cc95758dc8e3d61a6c5132cea31a9 SHA-1: 90811b4861190ec42aa3baffdadfd7e42c034245 SHA-256: 6109153d48cced88cc3d6f5a5bbf5ccb1d1d54fe1452ac10e897a54bee06c06b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on compromised hosting. The embedded URLs, particularly the one pointing to a WordPress upload, suggest an attempt to distribute further malicious content. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://ryokanclub.com/FileData/ckfinder/files/20210901_B2FB0984FD99FB63.pdf In PDF document text
    • http://rvhifi.cz/files/file/2098263064.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/80881217225.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/lanarisuwelisemisagiruw.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/15961069483.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/87571130333.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/witelubofefimubu.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/8598124190.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210905_052921.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/vanovigedesefibemilebakiv.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/10430372003.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109030956112245.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/76731897896.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/77a795e9e9d3512b7506c12b37653189/desasibug.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/86974568953.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/25e6b7ca45252576d4632f425720793c/lotoxikazedipadelujaxefe.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392156decfa---gefomawusuwajodi.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/88263823106.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/jorogifux.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/rabaxumadasilinurosat.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/91258249716.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/96795083130.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/93267494709.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/pututavadutemexafaregef.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/funujakipitutixepenik.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/91851111901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=download+diner+dash+androidPDF 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_off0000e5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 10336 bytes
SHA-256: 0cbe6cc11e6ab18eff9c8920ba0735a567689143efa9200a401f70ce4b584886
font_01_sfnt_off0000fd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 18776 bytes
SHA-256: f2d63b24a20eb0ae5801f722e6458fc243510779eb908f54fa29d21d0db0f5d2
font_02_sfnt_off00012dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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