Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2dbdb65fbfbccfe…

MALICIOUS

PDF

73.1 KB Created: 2021-09-24 07:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 83c6f24544603368f291a5e692d6ad93 SHA-1: cf327762f3b961ab90df756126259fae1ee77be0 SHA-256: a2dbdb65fbfbccfe17db622835eb0fa00cfaec54d9c3d10a06e380b16a3e9527
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are either compromised or disposable, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting vulnerabilities or delivering further malicious content via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://landatur.com/files/galeria/files/zigaxanarimusogilonu.pdf In PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/48b02aae9dfd6c1b0cf38a7a5d6f42af/68309420122.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/78111005663.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/52894111444.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/wibisifekajuxilafasu.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/6b7095994bf049a9d6376ab0f5700f36/nofukixixujaruwa.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/mipotijaravupikox.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/fununavo.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/zozeb.pdfIn PDF document text
    • http://ud2-140.com/files/41782149560.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/pekukalivixa.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e6ce50d3d---77880654881.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/zumotowizavitemepob.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1o9o72m5pp1erjvkocu4ofaqu0/lujimov.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/84874848100.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/82774989931.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/nojinigotavejevezevasu.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/wegipomolugozezolonadamiw.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139edd4e4dff---61700150965.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b536936199---zogovobizagodix.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/pulikazoledadipotufikut.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/51439541333.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/webunarobawak.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/90100830194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=battle+cats+cat+food+glitch+2021PDF 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_off0000bb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7C 16676 bytes
SHA-256: 631aff414a4c08fabae8b3582698a7126d32c9f4b8af3b7b2f779278157777a0
font_01_sfnt_off0000e598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAF 10900 bytes
SHA-256: 1f3084eb42bdbc9461a6b1dbdf0ae741fbf5fd11f439b192aaf29730228b2d2d

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