Malicious PDF — malware analysis report

Static analysis result for SHA-256 999a414c01d372e9…

MALICIOUS

PDF

95.7 KB Created: 2021-06-25 12:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2be3d7c4ad371bf36c3626bd04b3ea44 SHA-1: aa1127e09f89f5bd4950ec719000465505b32876 SHA-256: 999a414c01d372e9f3dc0dc4b345cdaa05560e1d8845da04e53d4f821cb857b9
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phishing lures. The PDF structure itself does not contain readable content, but the heuristics strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://1877painters.com/FCKeditor/file/1634456206.pdf
    • http://dungcubepgiangtrinh.com/webroot/img/files/99988832406.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-6-10/20210610141121463231.pdf
    • https://szaktel.hu/uploads/file/niluxalelifebuduwipo.pdf
    • http://deltastal.ru/userfiles/file/sitavogakafelunotax.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/kemuput.pdf
    • http://stressmanagement-karriere.de/userfiles/file/movimi.pdf
    • http://bike-aholic.com/UserFiles/file/tuwaxixevojo.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16095fe0304c4f---pidexufakidawejeki.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/wezudutuvipuxipij.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f72032a86---51100749612.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/22a76d9d2b7163de64449357f1e11d15/mevunirukusanejan.pdf
    • https://ceral.pl/ceral/pliki/file/waguvazupar.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078e5706136f---50463156934.pdf
    • https://ancoraeducacion.com/images/66549506727.pdf
    • https://thietbivesinhanhhuy.com/asset/files/69834885087.pdf
    • http://thedewakohchang.com/image/upload/File/6566321800.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=8th+standard+english+notes+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012a2c.bin
7ff4ff8b548f4108aaf645ec3094e0a221d35a80e351b39a951a4e06c4535281		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12A2C 27568 bytes
font_00_sfnt_off0000e63a.bin
3b40fc328b3124a3e6ae199dafb4e6f3b52536bd30a88aab72fc5d1f0b6fbc9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE63A 16572 bytes
font_01_sfnt_off00011151.bin
84eacd56a94f2dc1e2269a5476c7d3d104bcdaf265e74f2f4e925a14bafa425c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11151 10888 bytes
font_03_sfnt_off0001598c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1598C 16792 bytes

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