Malicious PDF — malware analysis report

Static analysis result for SHA-256 1003036cb64b5087…

MALICIOUS

PDF

77.6 KB Created: 2021-09-15 12:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c300ef7138821687f6b523d805f1da34 SHA-1: 8dc619aca95f9749260739d09d695e566aadd9e3 SHA-256: 1003036cb64b5087fdc567acb5afd8fed6ab8f0657bf99d17ce1b245e0c60d55
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous disposable domains, with one specific URL being a PDF hosted on a potentially compromised WordPress site. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d8f1164c2---35202956892.pdf In PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/82502426136.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/ronowidegapemuz.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/setuwegugegenifebuga.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/junakoda.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/rerifawijud.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/78011233081.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/50855116142.pdfIn PDF document text
    • http://edallyshop.com/upload/files/19042062490.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/10084120299.pdfIn PDF document text
    • http://innotack.com/userfiles/file/76885511389.pdfIn PDF document text
    • http://billsky.ee/files/file/jukatotajirani.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/witubikemaxujufofoju.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/pogoxinaluroragosodakabu.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/taxubibi.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/57381057750.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/gavuwotimejiwanis.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/82583442426.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/75968355008.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/22620401145.pdfIn PDF document text
    • http://alkanboya.com/files/file///gegejimufepugojelukawer.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021913015383316.pdfIn PDF document text
    • https://tmtteks.com/files/xamopesapajezamofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mega+iptv+shqip+2020+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_off0000c9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D9 10700 bytes
SHA-256: 322c34d53ed82e22adb72156f22b7663369915941dd8351c63bd45c6ecd11ad7
font_02_sfnt_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 17776 bytes
SHA-256: 6397da3cecf7e2478b07091248e16d5e50b4f177139d4696107b3f72c142dff3