Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34446dc677b66f2…

MALICIOUS

PDF

93.7 KB Created: 2021-08-02 22:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a21d0833b953848cdff409ab5ee34c0c SHA-1: dbae6641228afb1d9165b94a8d7780eb1bf9d742 SHA-256: d34446dc677b66f243a1d4cc17d0ab7e00b44cf29e3045e19dbc1db5831e2772
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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 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.
  • 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://people11people.gr/uploads/File/zureriv.pdf In PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/34463988235.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/aeb534960270d831f811e737d338639c/90842529279.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/wekujuzubopazod.pdfIn PDF document text
    • https://strechybenesov.cz/content/76841492878.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/74925896303.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e37cde04e---xakafobekovexi.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/d7jijkk4vqds0g4hhj23t521e0/dufolimutubezoridedesipi.pdfIn PDF document text
    • https://lemanssrl.it/file/zosonifuzaluk.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae146410db6---pupixima.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/13685988896.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/pufemobarejoxu.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/sobobapow.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/20f0980697d025010d6620f813af1d94/lofegamonekezude.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b06b930397a---2531197329.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dffb2978f53---fanujutilatefafujuzoje.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/35684441887.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/30730385567.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781dfc4797b---diwuzutujigofiwam.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/fk0manus2dp44g195fr8tfc63p/16588361704.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/f9cd9c65bf504c5baa0808a95b67436e/57574119446.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/fabekuvugiforidexafowena.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/33227473845.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161045c1a03d5c---lururenuxariwanoraxojif.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/14614551109.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a4d83a5a9---xuzetag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=glitter+force+doki+doki+fanartPDF 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_off0000ffe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 17092 bytes
SHA-256: 0de4cf48a9a1543b7a0df87b383507ff130a612122a1b6159bba5b771b28cd70
font_01_sfnt_off00012cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB7 2892 bytes
SHA-256: 6a30de02d927e11e0fce8f61644617faa0ba46bcce5b3a354582ff2fb2c49e62
font_02_sfnt_off000138ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15101 10432 bytes
SHA-256: 3d095b87aeb2be93b31deb4c65bc0d6056cfd7b6331ecb43965074847def00e2

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