Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5a7fdbbe116200…

MALICIOUS

PDF

84.6 KB Created: 2021-09-02 06:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 56acd23d05cee7ea1cb829b667ee37b5 SHA-1: 77c8d585a9d87dcd5b8e653bfe6e73c49ed2a5b5 SHA-256: 7f5a7fdbbe1162006e2c12d82ccf12fd5484ff42af0af9fe6badfc687b10c2e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous links pointing to various PDF files hosted on compromised websites, suggesting a link farm or distribution mechanism. The presence of these links and the overall detection by security tools strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.aluvascientific.com/UserFiles/file/xegofujukibukokewosibelov.pdf In PDF document text
    • http://sibinetweek.ru/userfiles/file/25250276455.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/78172579063.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1b1529347---63615996313.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/15176543961.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents//files/sefumubisira.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/p1nlsvu6a4t6c958kn9ehpo3o2/senimekuwupuxi.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/93067702472.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160d33a7328818---58396216645.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db395df3cee---titumivegen.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/bj1q2ec99cqfh99ij3avnpgq10/34040854418.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d33775362d---bodalujatijagewulibopatu.pdfIn PDF document text
    • http://brunsfamilyreunion.org/clients/e/e7/e70b0594429ddd28dfd4dd2f61c76e80/File/nevakaletugadadeni.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/somobelixazuzonepuvaka.pdfIn PDF document text
    • https://dm288.com/slicice/file/75370508798.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/onpisntj0hk1sj0uur2fc487nd/lopevavedel.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826d3aae2a3---pajabusifuzaxisirop.pdfIn PDF document text
    • https://telenovella-bg.com/files/kubusitajebiruguxepu.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/16318897046.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///wurupupogofero.pdfIn PDF document text
    • https://aedwea.com/upload/foto/76210423496.pdfIn PDF document text
    • http://stringladies.cz/userfiles/34106814308.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210726024822.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832eab3339c---zifuwuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=first+month+of+the+yearPDF 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_off0000e7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C8 17564 bytes
SHA-256: b548ef656e0fb5f9b603552d1e294271462a9478856c0d24edbf4bb4424dc4b2
font_01_sfnt_off00011553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11553 10524 bytes
SHA-256: 9c43df90485874e6d27252a01192f743f832e736432737de500621b903ae6fe4
font_02_sfnt_off00012d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1