Malicious PDF — malware analysis report

Static analysis result for SHA-256 5535ef3b899f4e8e…

MALICIOUS

PDF

89.9 KB Created: 2021-07-07 23:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d90c8685ebfc301e160e367f3839fade SHA-1: dd5344c9527c6978dba5efbe9a0646cb622cebc5 SHA-256: 5535ef3b899f4e8e83ec486507c968f46f1d4ec3a0f417c16485f871c75835ec
204 Risk Score

Malware Insights

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

The PDF contains numerous links to potentially compromised websites and uses a lure to trick the user into executing commands. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://mariopresto.pl/userfiles/file/saruxul.pdf In PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c9194da84---47653844412.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/suwefuzajewaj.pdfIn PDF document text
    • http://candientushinko.com/images/file/mijaxamepoxevipoba.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/lpimfhrdu0tm88ojp7cr6ftavt/80795694678.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/23523187360.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/31928218844.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/sifatiwipij.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160724cb222f71---winonaxalujegejofebawopud.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/73276659231.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078c7b8eb6ab---mezalorizirobikevur.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ffjidrleej7p1cinhfpd89uct5/12453748585.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/cd05c51bc4d1c03a23de697873d283b4/81902146288.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/5lfrrh7bbcgdc1l5p7n3s1cq7n/gasevu.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0f25bde82---38306888267.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7e2438318---tezasefaxida.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/af7ff426200478d48855cbda15dfbf59/76168216831.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a21e56f5a---92391055955.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/22558184395.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/00a6fbc1c58429bae4179e4a1cba2e9f/32947184104.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/2cf4eae09f1c0eb973d15e2b0b05c65b/gikabojekasu.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607821a19d461---42427705497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=why+picasso+paintings+are+so+expensivePDF 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_off0000f8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 10884 bytes
SHA-256: 0a57e31e43bea3cab4e1a861bd225970d6cfa9f22409aa203372c9a96a4f3dfd
font_02_sfnt_off00012a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A56 18368 bytes
SHA-256: 02f2600333ad039c45d03f98282031849655b42476a07b516f6acb82986a6412

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