Malicious PDF — malware analysis report

Static analysis result for SHA-256 2283fb5fcfc33a68…

MALICIOUS

PDF

75.1 KB Created: 2021-08-13 08:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a22fea65325fc73632318e7a8b57e68e SHA-1: 6ad7da97b1c8ee8ac74d88ff074e25933f7f2d69 SHA-256: 2283fb5fcfc33a6890d45a55002808038bbc69d4963e6e6b1ac6e6adb04b5033
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely designed to lure users into clicking, potentially leading to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdd25b7295---botuxizu.pdf
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/31649011827.pdf
    • http://soundspace.eu/Upload/file/tirusovigowolivim.pdf
    • http://araonline.hu/uploads/file/64001630031.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/dfghihn2pso0qvprv6jkot5ai7/27419460275.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e16599867---79903195011.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac42135df2---gurujulena.pdf
    • https://annjulieskarpmo.com/userfiles/file/tokesor.pdf
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/48090957959.pdf
    • https://attack.lt/images/files/rukefubomiz.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16075be5dadebb---jebegovanatote.pdf
    • https://majubesar.org/contents//files/fabopazovuduge.pdf
    • http://www.darvidproperty.com/news/file/pevujikebusibenoxijojolo.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607096b0c41e5.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1d93ed8b---lovunivevogifubibojotafas.pdf
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/3797590889.pdf
    • https://aradovan.com/userfiles/file/gopadaxebagasodupa.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102470c4fd15---62764571228.pdf
    • http://www.cerel.eu/images/wyswig_images/file/xoxinesilasup.pdf
    • http://yuha.be/_files/file/kosud.pdf
    • http://centroolosprato.it/userfiles/files/wolevileda.pdf
    • http://mikomisushiwc.com/uploads/files/61286461209.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=doordash+promo+code+2021+honey
    • 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_off0000bf92.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF92 16792 bytes
font_01_sfnt_off0000d7a9.bin
90a9383771f2e3c44775e6c8e9370c8bb2eb2209e7f4b9764db3783922d9e8d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A9 10952 bytes
font_02_sfnt_off0000f0f3.bin
ae0b59ce0818d0e26b8e0bad56a090c4b9badcbc689802ab2632b5283a5062b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 18180 bytes