Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b5e995b8e027a7…

MALICIOUS

PDF

84.1 KB Created: 2021-09-05 14:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0fd74c10790390c4fe4bd44aa1b66b18 SHA-1: 90e1a601fa1950c115f2457eb577ab00dc94c12b SHA-256: f6b5e995b8e027a79ce1d92f46fcca07967086fd998f081390fc815873caa658
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external resources, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure itself does not contain readable content, but the presence of these links and the detection verdicts strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/b9108adfe1ff3cc06c365ee2d59a4bbc/84454387080.pdf In PDF document text
    • https://sportsht.com/userfiles/file/voxefojo.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/4456a57b54e2a0b45f06487a8cf99a58/nukelemawemogazamatarosa.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3cc5b03a8---sekaxasolunigopuvudux.pdfIn PDF document text
    • http://balone.net/_upload/file///kukanifijejo.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/12013193411.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/12884550142.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/jetorow.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/wulanobozapoxafivamawo.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/22808780096.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc624f21c---vipufabopodifuvar.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/fd98bd17f5f54f076b4911ad01e34c78/nurulevujepilaserejomi.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/lonosakuruwupeduxumebil.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/29397590580.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/71679554311.pdfIn PDF document text
    • http://naucseto.cz/storage/kizotodanimunomojatawoga.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607721a2d214b---90736732982.pdfIn PDF document text
    • https://chptravel.ir/data/file/boxibejogivizinilefatugud.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd79d9b24f3---74144517407.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/d2534762d9e38f3c23533805e51f3c72/40896184458.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/7c43324g5besiam310rbhia312/66135276498.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/48f7e5da47d06423d21c849bd2e42120/94938969551.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/13abf2eb00720fa55d080de5023b5ee3/80488559860.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/takudixusepodowokodovavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=servsafe+coursebook+6th+edition+pdf+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE126 17924 bytes
SHA-256: f120e574eb76f00fd210af330758b2395922edb09ec3834f7931cd8b8db5ec95
font_01_sfnt_off00010f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12770 11444 bytes
SHA-256: fccd9d3f83e7b981ddff4d435340dfe3f44dc42267cb4b76e9b9fe55208bec13

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