Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66bf9a155baf4ce…

MALICIOUS

PDF

92.6 KB Created: 2021-06-25 22:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c744b7d109669c51795e9224a4a686a7 SHA-1: 5a5581ce1b5c608e9254d02438fed966c42a9da4 SHA-256: d66bf9a155baf4ce3c7e42e25cdf6ac5350f58347fccd645160a60c9e539aee9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the structure and URL analysis point towards a phishing attack pattern, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://karat-dobremiasto.pl/userfiles/file/rilitedap.pdf
    • https://betenenergy.com/sites/default/files/file/zoluxemakuvufesivibuz.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/87b43edb84bbb298ea4425a2f9db9327/vulaliv.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc17470b14c---tixevemaloduwemifixike.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1adfe925c---xusarigowaw.pdf
    • http://davidhammerstein.org/userfiles/file/fawiruziw.pdf
    • http://acmemask.com/upfiles/editor/files/fikesaboleburusakajupi.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/nozex.pdf
    • http://101-games.ru/images/uploads/files/razuzosobasuwegofivafo.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16097386dc0067---24097948955.pdf
    • https://sjalikave.hu/pictures/file/9215658484.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-12/20210512052143181407.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a29ac456702---72104678208.pdf
    • http://historia-bfured.hu/userfiles/file/bofajetupomokan.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160912c0f6ebeb---zekimadusojoziloneximasa.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/fc49ddb6fd9949c6c440b187b7550b66/wuvozabibitedebevipuv.pdf
    • http://ahkjt.com/upfile/file/73236133127.pdf
    • http://af.ssla.ru/images/fornews/files/tinoxumobe.pdf
    • https://fallsplat.se/file/lenodinakixabofafom.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=parks+and+recreation+special+online
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010711.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10711 16792 bytes
font_01_sfnt_off00011f28.bin
c71a477169b84817b78a5e47b7b4649abd485a92d714ca69cc83edf620c6a6df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F28 10600 bytes
font_02_sfnt_off00013778.bin
6f7df538b2547f217ac68955a0061345f7816c7859b0cd6f8683b05116499e95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13778 17548 bytes

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