Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b92ef0150a44ad5…

MALICIOUS

PDF

97.8 KB Created: 2021-09-01 16:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67db663b8d4a658425a6d320508cbbc1 SHA-1: c32b47694408986abd744a015e27e1243640d439 SHA-256: 7b92ef0150a44ad58b0852ebc0a0a220515777949d74af4cd55975ba1bed3978
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the PDF's structure indicate an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d25d18a56e---gomaguwuwesipetaxabapuz.pdf In PDF document text
    • http://rem-stroymont.ru/img/file/27273982573.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/lezarosemowuvivamesenu.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/32438127313.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/vezosupek.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/qvc8r4jguak3cmfccsui23bolr/67139583786.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084f555c5d2b---butujumekufaviwew.pdfIn PDF document text
    • https://alutat.com/data/file/sumimelazidewaxavukadosam.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/36005697685.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/98891392701.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e8d582f3f8094aba28ff45abc914f978/goxasasobadazawuxuzu.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2153mu1fgmtpitjcrocvqr2tg4/39234167171.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/kupureferelefulelalenufiv.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2e8258c43---45684797824.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/1bt9pm3pq141jr0bbcricaep13/71396780853.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e4b743962---xogonawelupaxusogef.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160896dee2f33e---mavaz.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/xuxodogovuparegu.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf748bf3c81---72407462370.pdfIn PDF document text
    • http://honghuibio.com/d/files/farotamet.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/tesemadixijigozijedil.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/jorixorukedulatawavoxolap.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/572b4df6d2628aabeccf2f865de63261/megadupafobosaritefanati.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/xobupalugirixurugur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=light+skin+and+brown+skinPDF 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_off000119cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CC 10624 bytes
SHA-256: 11ea0c8793cb0f25744b946e7fe7dfab6db08476781931f2fea91c40353d628d
font_01_sfnt_off000131e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F2 18060 bytes
SHA-256: 5d99ab90275deef3c182c16cdccd2e29796680c86acc8ac49be5aec8d704fe04

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