Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb2ffc025f00e2b…

MALICIOUS

PDF

98.7 KB Created: 2021-06-26 13:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 932fb5b23257d65d01c60e606959cd7f SHA-1: 2facde97f0f952d9f3785172cad708cdfa1e05b6 SHA-256: efb2ffc025f00e2bd4a8c274c6418e7c6fc7b88b6c6d2707b73690a9ac0c401c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external URLs, several of which are hosted on compromised CMS platforms. One high-severity heuristic specifically flagged a link to 'doublehappyvstheinfinitesadness.com' as a compromised WordPress upload, indicating a likely attempt to host malicious content. The ML classifier and ClamAV detection further support the malicious nature of this PDF, suggesting it's a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pressvaluation.net/userfiles/file/posalapexojivamo.pdf In PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0574a6da86---bixoxitoto.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/xirijalojeguneneredewi.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/parezozoxepotowu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c69084883f8---50870956976.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210607021631225201pgc8tu.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4ea550ed---jobufinonekesonekotade.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070daaaba8ae---benigexutifekutirojibita.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5ff8c771a---90099503452.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/a91d026f2be090c66593827caba84b89/6239642020.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa719af147---37743997416.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1075aa2a90---43445082701.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/5155058776.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c863fa6b3c8---sudupofovizekopapakame.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73f0ef3d78---25565604042.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/41952474431.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/3344421238.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/210462739160cfb9021118f.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/jilezidori.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/evc26lk8pjfu91qecvdnkoh89k/bemaxitewogijot.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/0dc1f261bc1359129c79fed552f191fb/kusufiw.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/352816686.pdfIn PDF document text
    • http://barksdalereunions.com/clients/869108/File/wanunelimiwovovojegigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=is+osmosis+a+form+of+passive+transportPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12024 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_02_sfnt_off000136f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F9 17000 bytes
SHA-256: b038123ae0e888f14cd7cd49b4f0029d7b7be5519307a7b883f58bdf279a8a06
font_03_sfnt_off00016396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16396 10488 bytes
SHA-256: 28659963fbcd51ab8e9beaddfb2d03116a23e34a86bd05ccaf05a4c3e4d7e730

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