Malicious PDF — malware analysis report

Static analysis result for SHA-256 f851091c9c260d29…

MALICIOUS

PDF

87.7 KB Created: 2021-09-02 06:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d3e7e534ab076eb68a76c9bb8f6ae9b SHA-1: b3c36a786291e967062e0dad058a2b81743da54f SHA-256: f851091c9c260d2961de388f701895e1e8f7d567e9698b9a05b415752663309f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, presenting numerous URLs that point to compromised CMS uploads and disposable domains, likely to host further malicious content or phishing pages. The PDF structure and embedded links strongly suggest an attempt to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae711ad2f13---zixizumelexeligujazu.pdf In PDF document text
    • http://labonscafe.com/userfiles/susegenexobexuwasumiw.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/1d9c80293e55d86d9a234c45e01407c0/34405193888.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/ramodexamawip.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/38441454685.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/fejunonilegonajiluwesu.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/73987596100.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/vajozidinujisoroni.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2a668cd979c782ead5c3c90b6e1131d6/xumafarupero.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210901233106.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3f6bb8e88---tufigojiroruzofuguf.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2s6g78qnk9fjuettocnnqvari0/53549730173.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/xepomokofozarudifusuredul.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/pawawuwilesoselinu.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/18374638700.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa25a3a1554---pamubolilanigutiwarez.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/2511880267.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/wesivimenu.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/zetemokezemaradolu.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/32376465194.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/55918771793.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3cf1c484c---xadurulixezumawuxu.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/34105020168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=could+vs+would+havePDF 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_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 18872 bytes
SHA-256: c9b2ae34ac6f54dafc448d870d72a4ecacd9ddc4212c1f349e2d22b17ffb0cea
font_01_sfnt_off00012191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12191 10232 bytes
SHA-256: 619d2385f2da205e127d1470e99098e9edee3d0b7aa6d0ca6c3d1cbe20d47c24
font_02_sfnt_off000138cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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