Malicious PDF — malware analysis report

Static analysis result for SHA-256 2153657918b78dd9…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 05:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a0b1ad727cc8e7b41fd097cee66e18b3 SHA-1: 6bbccf9ae70df590055fa06040e5cb5ccb969646 SHA-256: 2153657918b78dd932a4c9b650bbd5bdaa98d3a9c963a46378e0daa55397f88d
164 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The presence of 'urgency/deadline' language and the ML classifier's high confidence score further support a malicious intent, likely phishing or malware delivery. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://diakmelo.hu/ckfinder/userfiles/files/67342056725.pdf In PDF document text
    • https://vialivonica.eu/userfiles/files/fafisurininazebotuf.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/tedopivuge.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/76840974795.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/66274064601.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/93479298170.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/wewoxudipiviso.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/pejoxolugevixi.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/66337815936.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377c281c0c6---18532709975.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/97072416258.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/38783706558.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/pojakuguvu.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/83649413610.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-6/20210906035030246408.pdfIn PDF document text
    • https://alev.az/userfiles/file/wawokefemezenunuj.pdfIn PDF document text
    • http://master-vin.ru/files/file/satisenokizipifosodek.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/96735358930.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/47808223181.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/83765281555.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/55257459436.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161301fb19f503---gitoxowuweralawofokoxapa.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/vdrf1s3nttt38lfhqq7ft7ivlr/verenojufazobaluborilefi.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/ranirerudotuwaziguwofaz.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/nobaruwosurepitojifegop.pdfIn PDF document text
    • http://benrassam.com/uploads/files/wirasefutosodapipex.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/46875086848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=mba+research+methodology+questions+and+answers+pdfPDF 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_off0000d72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72E 17464 bytes
SHA-256: c8ea31a46493e82a6189328201fc8996ebe6e5044f3a09a14a5a65ad31347ab3
font_01_sfnt_off00010492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 11648 bytes
SHA-256: 3e2a3896ee9c7c99a2dc495ebc08edd9ce35d0ba5ff392e8341f5f47f022e329
font_02_sfnt_off00011f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1