Malicious PDF — malware analysis report

Static analysis result for SHA-256 2566c533db66b206…

MALICIOUS

PDF

84.6 KB Created: 2021-07-17 00:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d97dc24dc622d95af1b71481bbbac9d SHA-1: 5266661f6c78ef0fbfdfba1ac98a8c647b18e884 SHA-256: 2566c533db66b2068ed1dc0072a5fbec1a0d5b97fc49e663478555e502658d4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous disposable hosting sites and compromised CMS uploads, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it is designed to redirect users to malicious content, likely leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://karmand24.ir/basefile/ehotel724ir/files/18460049412.pdf In PDF document text
    • http://vlajamo.cz/images/file/18132532019.pdfIn PDF document text
    • http://alkanboya.com/files/file///66902631561.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/tpvraqe969rt3o0kc31epkjmb0/tumajomivugidilaxuwik.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/lowajofuteweg.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/mabudolinuvosopupidija.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/ps57rjeg301tt1505euahttrr1/99241646349.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/6aac72d049a162c6cb37ff481bd053a4/lefepakogevekirotebupit.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991d00ec61d---8131599019.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4272c214c2---90829905841.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/zifozozokedela.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c3f9846e6---tesexuzomafetetib.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/feretadotesisilotivatiraj.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/15510076988.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/on8h19qd8rg36aq3acsv72ll7g/15876709327.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/1f1e7c1091515a6e3967b10ce907115d/19966559376.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/xomuved.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf39244fea---vibin.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/gaxavulofumo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ea853a18c---95642447017.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/35741045462.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/p8avleglom52limnho73odh0fc/40195548567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=global+and+local+temp+table+in+sql+serverPDF 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_off0000e6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A2 17160 bytes
SHA-256: 6fec8a05f7ad7e23d34aac21ddbb811e346261dc33964ca2d8a8744e5bfb2094
font_01_sfnt_off00011389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11389 11064 bytes
SHA-256: e19cff33b275f4e416d9dc14ebaa892d8ea800886c9e7ed0f28ddaad680edbdf
font_02_sfnt_off00012cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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