Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e907b54577c4eb3…

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 17:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 973d8141a63d75db9840c3b78827373b SHA-1: 07138ca9b5246a910f9b38aa6f2e6726c61b0788 SHA-256: 3e907b54577c4eb35b6771484d18ccfb5b477a24aca7f082d15cf7bee15a9ce8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a large number of embedded links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern. No scripts were extracted, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://przychodnia-felinskiego.pl/uploads/editor/file/lejajuropo.pdf In PDF document text
    • http://locthanhroyal.com/upload/files/7058235094.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdffe5a36b---99818423707.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/tagodasilizujakilakiz.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/dezawez.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/pumaboxobolewikuvab.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/jozuvezusunijivajuvimavi.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/52870441461329ae5c0db5.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/ziburepagubisefun.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/tawepalanuzidudixigi.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/bitunisoseso.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131bbe7b4a88---mufeni.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/72218639953.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/7983865447.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/wedajurigozaxadavupax.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/bifuvalada.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109071059291796.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/53878175829.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/japana.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/nabuzobajoguvilinujomeme.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1630993010a4478a66bee9812b0804.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021982250444449.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/kukatabigazozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=parental+settings+on+androidPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4104a78924d9a2e2087ef0d4865d56d7/nosesagenuzugolexut.pdfIn PDF document text
    • 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_off0000dfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 10424 bytes
SHA-256: f56095baed86c595474d456da96e2795fc51cc9b074ec74433835797dfcaf10a
font_02_sfnt_off00010f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5B 17556 bytes
SHA-256: d997f8e1ca2d7dcd6a1006695c96f7180892ae15578d214a886b4930d685681b

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