Malicious PDF — malware analysis report

Static analysis result for SHA-256 d146163d724645e6…

MALICIOUS

PDF

80.2 KB Created: 2021-09-09 02:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d48ac84e061da142f184bcb468a64e6 SHA-1: c5ade7746426447143f11d5721b1ac630e250e82 SHA-256: d146163d724645e645af52895168befe3080351c168358da90cfede261d35cc3
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm or a lure to download further payloads. The presence of a 'download button' heuristic further supports the phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc595e3246---vexeligukegatunatuvabu.pdf In PDF document text
    • https://kibledergisi.net/resimler/files/xunutelik.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/74263509554.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/3048814148.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/18805674994.pdfIn PDF document text
    • https://websbag.com/uploads/files/zupiwedivoxeruratowazofi.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5766e53a1---39377780844.pdfIn PDF document text
    • http://zaiger.ru/img/file/23203292804.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/soxofenivifite.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/41436449716.pdfIn PDF document text
    • https://questyme.com/userfiles/file/68377557437.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/42241422748.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/85615278694.pdfIn PDF document text
    • http://guowangcable.com/d/files/xiwemitazapobatig.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/lilebisosifoxaguwijuderu.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137dda462632---makakerururidovalife.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/60494159320.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210904091844.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/58583644569.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/58386378093.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/xutevefagaz.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/rukokexaxabudepimapozege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=fluid+simulation+free+mod+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_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 10828 bytes
SHA-256: 8c253a33784d78a2fcb81251e67701b54731e13a4f999f9d7ff5e9c448395c74
font_01_sfnt_off0000ef67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10779 16988 bytes
SHA-256: 2cc5ff48af33dd5ee48f5a5e4c3a46cd484b43e548adee27d85927681b801055

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