Malicious PDF — malware analysis report

Static analysis result for SHA-256 27bd1f46e1d22b43…

MALICIOUS

PDF

83.2 KB Created: 2021-09-03 06:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 973d8d0b7b337db5ce81379706330c2c SHA-1: 252a0fa5186f194ac53a4b4934974f084220fca4 SHA-256: 27bd1f46e1d22b4328d90bc10d7454453cbf25b63cf3cd8d5c0330eab5641db6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external URIs, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware downloads. No scripts were extracted, but the structure and URL patterns are indicative of a malicious distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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 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://irlanc.ru/uplcv?utm_term=colour+mixing+chart+for+acrylic+paint+pdf PDF link annotation
    • http://sksound.com/userfiles/file/31698746170.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/wetipad.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ke3qdiagpbj7kmp62re89pvcra/10414120663.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1bb4a87af00262af8ed17327188d7626/wagobeguboxuge.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/13611580548.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ni1uks7v2fl6nbfbrmk8a9ru92/76314055940.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160787025bb489---pasoji.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/magepubokipikizagok.pdfIn PDF document text
    • https://bdata.vn/upload/files/70814271321.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613000d3d5118---basenurof.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/mekodugedagis.pdfIn PDF document text
    • http://tythb.com//uploadfile/files/poredufizavitutof.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/23506274833.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/75135982777.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/cot8q461ipk37vo40u6pnul0es/gisil.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b338ec2720---3616251592.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b688d4b6ea3---64295246334.pdfIn PDF document text
    • http://mp-journal.com/media/file/wogokivu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/36790143433.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/74197444186.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/dopokebabelavoporos.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/c8ed5154fad0b6e257f1c50ead0f8922/71698767215.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/146887404860a6f887641b5.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/51d4a609922882c6c47337baa2477fc0/sodojovixamaguba.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/fae6d7568a43d3c01d68898655935b51/ribulijogi.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a19460d1d6---14831090852.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_off0000e1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B4 16944 bytes
SHA-256: 957a9f6af4a204d7aa1e726466ce91cf39ccab1c2218a8093190cd33a8b22d28
font_02_sfnt_off000125ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AB 11116 bytes
SHA-256: 4a4b40e0b12e83b113189c9c29eb4bb536a4e59a5787102d63fe173a2f1bcc8b

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