Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49f7e664a445cda…

MALICIOUS

PDF

109.0 KB Created: 2021-08-15 02:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: caff3ab811c21f1df0845019c629b147 SHA-1: 066543e47d0e67e07d871f90f42b569b953b3820 SHA-256: e49f7e664a445cdabd889443e0ca9c70cf3456939e5d0b454e1a1c847864b7de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external links and the PDF structure itself are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • 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 https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfeffe20bb---44694669523.pdf In PDF document text
    • http://hakkabrothers.com/userfiles/file///28804888145.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877cf4cc119---zimofizojidugawupo.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/213eb4e8ca788700cac1e3744edba939/53464924617.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081028b3d342---33684885499.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/lafop.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/30978534558.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/b402ce076063f34f8f624e489fbe4f24/50327996174.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ja1phdl77oui7r45vtlmquq1bs/33204874400.pdfIn PDF document text
    • https://salwangurugram.com/files/werikani.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/3590523344.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/24323530718.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af9fc9b6519---rajawobexowozemebiwuduf.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/fatijagonokimaputikege.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16089794883e48---76124956276.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/89709534979.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/vr058tcodbjg6pjl59drh7rj66/28764130745.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bf28af7d6---pigofa.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab9cc08a5a---vesemesapexokure.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/de8a425aab78f0f965408ff7d1bed3ae/nizuwikedonerozemedep.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/90193014556.pdfIn PDF document text
    • http://rurisnet.org/images/file/31101217846.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ju364e7j5uutsu8ekeec5aaaf1/jiwejagemekumiworudusupaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=aceable+level+3+assessment+answersPDF 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_off00012e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E58 10624 bytes
SHA-256: 38fb6729804a4644a2aa63bc950ec447ded39dc02f8c876300732a4d211f4e15
font_01_sfnt_off000146c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ED7 18352 bytes
SHA-256: 5bd7347e9b04ef84a3870b705154d8d0e7688015e58c73033fed9f1fbf2b7bfc
font_03_sfnt_off00018e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E8C 16468 bytes
SHA-256: d1e063cfd1194475f6d6c756ee16ebe76bb55678bcab97f4e9bbcdff5dccde92

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