Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dea38924a690b30…

MALICIOUS

PDF

71.5 KB Created: 2021-09-06 06:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 20cb0e0a8e8d3a0c3ce57d5e14fce98f SHA-1: c44676b5a8760eb99ef5a556bef32c31a0d54d5c SHA-256: 8dea38924a690b3015c2b86691a0ae693c062d728567fad08383e6c8ccc42294
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=hindu+religious+books+in+bangla+free+download+pdf PDF link annotation
    • https://hansenlight.com/UploadFile/files/dawukikovofaxaxemelewik.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096254643d4d---nudugevafine.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://retroldn.com/userfiles/file/47330781411.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210722_236479443F67B880.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/38315688443.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/20fb8f0c4449905c7629a37451ff347c/rikiriduvozoferawamepo.pdfIn PDF document text
    • https://protrialse.eu/files/files/57929390557.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/jorif.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/xituzumetusumuvekolam.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e01f02690a7bc571cb572e988ee6274b/51391822876.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f61099e5e3c---45502467561.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/7a61a1nn70vabmklsp3eda82p0/84108167068.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d06b306d1---jatej.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/29662552652.pdfIn PDF document text
    • http://lecostationery.com/files/file/85537568727.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a84d586b5f7---judivajajatomewujogo.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/xojowujaled.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/fa9a511497632a37dd214e7c1d062031/nasumifafedukug.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/99436898648.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/146bevgsq02uo19gs65its64tu/sabuvimawibafuxof.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/79541565167.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/169972424160924b0f5cc81.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/76336669994.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_off0000b553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB553 10984 bytes
SHA-256: 819fe52195d0e10d2d64c12c4a4519e2fa57a94f0724847f6a24e7a31d9017cc
font_01_sfnt_off0000ce82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE82 15700 bytes
SHA-256: 843b54b6cd661a81a49da96a4d009de87e36ade72677b1bdf1dd9d361f501bb4
font_02_sfnt_off0000f5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.