Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d756b38badb3a89…

MALICIOUS

PDF

76.1 KB Created: 2021-09-21 03:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0f49d0f861cf788c58c04205b5388bf7 SHA-1: 08f9ecdcd9307555e8514f5babf0e2314a3002e0 SHA-256: 8d756b38badb3a895b9de70bba974f25ab74877cb7a5f9ece122ab4de45826bc
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 ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure point towards an attempt to exploit users through malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pierrelemagicien.com/userfiles/file/vegavu.pdf In PDF document text
    • http://dogomanhnghia.com/uploads/files/lezomepekuwogurekub.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/bukifesunoxudutut.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/vosawoparixesef.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/vidut.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/10033212779.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/dikowagageloziwigimixaju.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614719818ad80---61528512451.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343fe817538---68467826913.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/17249162360.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/45408226348.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/logalidagafe.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/24990201298.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/65996838715.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/88332983778.pdfIn PDF document text
    • http://tykhchem.com/upload/files/70690872696.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109061206421122.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/dewijugunawut.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/kupos.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba3624e1a---tuxewudajatonilikopuva.pdfIn PDF document text
    • http://xycrusher.com/d/files/xubegutijal.pdfIn PDF document text
    • http://usmleworkout.com/files/file/rovodu.pdfIn PDF document text
    • https://ikansambel.com/contents/files/37683561688.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/32525553666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pokemon+trading+card+game+play+storePDF 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_off0000c63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63B 16776 bytes
SHA-256: 6c89abe9e470ce51de603dbd29ee575aa15b3077b1eff4364f260b980d244d6d
font_01_sfnt_off0000f142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF142 11064 bytes
SHA-256: 29763169e2efa5bc2a07d26cd6133b8a7800c803cc2bb254cd16c6a5099deffc
font_02_sfnt_off00010ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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