Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b319da06748d80…

MALICIOUS

PDF

72.1 KB Created: 2021-09-14 07:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c32e7864a5dc7b97c58252a9649d96fc SHA-1: c69a28d5e6c11fc2f9ae70636aa2189b0ddb0777 SHA-256: 38b319da06748d8046da89447e719f30687bfb251641416b42da3f31795f5a66
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The primary goal appears to be redirecting users to external sites, likely for malicious purposes such as credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ilovehikari.com/uploads/files/8225812305.pdf In PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/rubefewazum.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/34116341030.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///somirudogi.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109090636435085.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/gurezaxifiwapedikifisunak.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/netixo.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/0eb0u52cqik2f46cl5fptmgc65/tovogejexulaga.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/2242737070.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/14355198291.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea5834adf0---jufexazesopovodasosi.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/43768337298.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/29468717101.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/novosileneto.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/zubexasogozonagibozorebe.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/25352164995.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/ratonudofafibaselibajoda.pdfIn PDF document text
    • http://canadanur.com/resimler/files/19945876586.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/1502b7ae187284612da67c777e009dc7/75708241209.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613f440350339---19968281643.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210912022703.pdfIn PDF document text
    • http://zerosquareonline.com/file/kuderawuxujuner.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/nibosamasenekedemo.pdfIn PDF document text
    • https://servicepapik.ro/files/84066837513.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/jadomizuzez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hex+code+calculatorPDF 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_off0000bb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB33 10192 bytes
SHA-256: 779b19c960aa4c82e30b54369072254e577bd6165d19598111873ae5657fd5a1
font_01_sfnt_off0000d22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 15888 bytes
SHA-256: 12700ce6481e222ffa2d7f76c9d28d2fd15651983cda65973f56f462cc0c4243