Malicious PDF — malware analysis report

Static analysis result for SHA-256 821f2e8d42e18cdf…

MALICIOUS

PDF

72.3 KB Created: 2021-09-11 20:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee19d788f9b0626e7e89942be15eae02 SHA-1: 4cdee784996e565b4f7250863c9ab92fbd93b091 SHA-256: 821f2e8d42e18cdf3b34a660d28a60afdb42ae9d344271e7ff7bb176e6443081
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing analysis of specific content, but the overall structure and URL patterns strongly suggest an attempt to redirect users to malicious sites.

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 https://krisoc.ru/uplcv?utm_term=how+to+download+minecraft+free+in+android PDF link annotation
    • http://baby-daycare.com/uploads/files/202109102002037759.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/kafagerinewelusaroduzij.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/jujuximaxoziraxoma.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/retulug.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/rijotewinumun.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/momogumoge.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/bazonumivinejuvodej.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210901093555.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81430203902.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/jufubikerigedowejotugo.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebffbd0e75---51783077076.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4da16d5ba0696c4aa1456c3fee844017/11378928088.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/88117389849.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/laxebonevenuwowoza.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/noxatanojukubukawuda.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/kasoxelebubovanadexonez.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/rexofejuf.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab644bac3---vobinizabinokekelabetu.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/golijejunuraderatevusalis.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/25f22b08768d404d8fe851ded74d1910/49997198964.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1e86540ff7647d99787121ae50bd377d/10256034466.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/rorozigurutasuvemewag.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/ropivagozok.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/20865255279.pdfIn PDF document text
    • 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_off0000bb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2A 15864 bytes
SHA-256: 330ce1996f279fcd465fb28598b68081d255749b3465a018fbc7d4244b406176
font_01_sfnt_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAF 10548 bytes
SHA-256: 37b3bc8b52d0f9b14080df7489d8fc5b445b1a8493cf189ea51914f055c9bdfe

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