Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4d41c29e9be8f0…

MALICIOUS

PDF

68.6 KB Created: 2021-09-24 21:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2300c1769225c41ec1bf1fccc16ace1a SHA-1: 313cbfde2302d6a0c203db833e80dc040bf0f038 SHA-256: 8a4d41c29e9be8f043bd652aed3a9c767dce9f743c5194aaf725d3a86dea16f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, suggesting an attempt to direct users to malicious content. The presence of multiple external URIs and a link farm on disposable hosting indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://analogsys.com/uploaded/file/1926688052612f317c77a35.pdf In PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/9ede85431354d15662bbbff6e82d22fc/28588979705.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67794488252.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/rolasarimirajuzud.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/17447640799.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e3d8d39c3---sojekipux.pdfIn PDF document text
    • http://podarox.ru/public/files/roterezarex.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/97114877667.pdfIn PDF document text
    • https://kermanrooz.com/img/files/48662745927.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/12224403900.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/42383751827.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210908_BAB6A64126C95424.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/samoxawedosa.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/kafovuwetunodo.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614097221817d---47829267985.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/wexurasirajog.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/fipurevuxobelubovuzoxu.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/sosewijubipipup.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/lufatojenitosojulawetuvu.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/rolix.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/gozarunuwodukibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=flat+shapes+in+mathsPDF 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_off0000afbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D2 10272 bytes
SHA-256: 2a14b0752f7d2090e43a836314905e6aa18eb89908110ae31f1d0b29fb30ee1d
font_02_sfnt_off0000deaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAF 15244 bytes
SHA-256: 53f686015bd097b4bba8855137f3c57f9203054b3c76a09e0684fb30f22f23e4