Malicious PDF — malware analysis report

Static analysis result for SHA-256 311bc1a15ba4fa8a…

MALICIOUS

PDF

87.9 KB Created: 2021-08-18 17:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3eefdbca7a0eb156fa6ac5097504840f SHA-1: bc732b0edbe9b487bbf2ff373e01eac6a1f809ad SHA-256: 311bc1a15ba4fa8a6d31ac6c625353b3e2554e88ccefd13c72a79549e8024ef4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the ultimate destination and evade detection. The presence of multiple external URIs and the 'link farm' heuristic strongly suggest an attempt to redirect the user to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/51008a7039de39cbcb9f6c0644941fe2/kobejevopinarisitugutok.pdf In PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/22365946582.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/2b4fae204b97d0490b8fed9a8d1a2284/8211364353.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/37320967673.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/kuvuful.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888a4a28caf---gumokeremamozaput.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/visabokegiwoxateterememu.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/tukigebixarodemole.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/nc34p50jtt8rdj2gti3ajfr2hi/31876876118.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/menezudotusovavezo.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608002381b9aa---kokukad.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080154d9bb92---guwaxaj.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/89254363974.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fb4c6335c---51734442997.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/tupubesotesunurob.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/dcf8af7d63dd7af52f185ab71b3b633f/43042425704.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3d3134e14---76242897233.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/poresakumataziji.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/45871460275.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/nijedimijabite.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/93987894549.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/49480114126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=blackmart+alpha+pro+apkPDF 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_off0000f553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF553 17028 bytes
SHA-256: 4ec9b7ad6864d0c52bff4b9ddbfc880e8d90898b191ed32459d1296f675243bd
font_01_sfnt_off0001219c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B3 10288 bytes
SHA-256: d718218b758db1cfc8b5932ed9213c547d967201d2a177f0b0cae907aaa61cc1

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