Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a22c3f67fb9a48…

MALICIOUS

PDF

93.5 KB Created: 2021-06-30 07:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 44cacce8585bde9faf843f69e5992e71 SHA-1: 8cf415110aae1a1792972eb81e82d5643a90cdde SHA-256: d4a22c3f67fb9a48ac84327ea9644e8702b3c8b369b2a072fa5dd7a9973df5f3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • 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://www.northern-japan.com/image/upload/File/regilirupojewoniruziba.pdf In PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/55841157606.pdfIn PDF document text
    • https://smithsgame.com/calisma2/files/uploads/16158967723.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7541e1241e---14212231333.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210531_0DBCD8359DAD9DF0.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073dbb0ac933---moxeboxawofetuluzupelidan.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/zezupugegamagare.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/4306974717.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/nofonumosi.pdfIn PDF document text
    • http://peoriamayorprayerevent.com/clients/1/16/166e3f524b51ec168ebfd48f86188a1d/File/gemasulonovifejeteri.pdfIn PDF document text
    • https://medtek.vn/storage/file/19265103836.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd7acad511---nuxemojoliwi.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086259f7949c---zevaluxom.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/jagubomumosagotolimino.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/78b38ae0250bc6ee970ea385e07e5e33/towepazezowot.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/xerena.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/gujofatexar.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc8ff34ed4---24065836950.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/sawizorasejatekilitere.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/25478440609.pdfIn PDF document text
    • http://poorclarescork.ie/images/fejulotimuketedox.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/67e6cca016478d454b30b7c441e8a928/kinarodapifevilemeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=modern+day+missionariesPDF 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_off00010cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBF 10372 bytes
SHA-256: 0054f01b9fe14faa375df17dfbf01843401bce168b3cb603031bf47f24abff51
font_01_sfnt_off00012424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12424 17124 bytes
SHA-256: e74926cb493d8f88dc37831fd964c9b727bbaefef9aeb980fc61d2437017a8ca
font_02_sfnt_off00015104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.