Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d56e8a15843dd1…

MALICIOUS

PDF

84.4 KB Created: 2021-09-03 02:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2a0e7fe9891bae9260bf61dba7915bf9 SHA-1: af73f37a2de89199ecf4e308564f9e53cca0f25e SHA-256: 16d56e8a15843dd1d9e45c51301781b0575cf9dfcededc3fd8d0c81c4c0a508c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories and link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The primary attack pattern involves directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://megalaserasia.com/upload///48601594242.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c50fca2001c---79018132680.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/33838330387.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/39561575011.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/65165588127.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/jp5pimqfqlimg5rd7fmml837d8/32502816373.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/99388838480.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/wogine.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/b8fcd1f00acd46bd8b50b75977ca34b9/xiginolureworevisiroza.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/84950690935.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/1c4bbf4e7c9967562b5ab853e00ad59b/47217725879.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/3681287311.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/2064876483.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/55667874863.pdfIn PDF document text
    • http://shamayachts.com/upload/file/deliletesovopoda.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/jafuraput.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/wovesaselapupasuvili.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301f3f74bfd---64874282760.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/64276108553.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ddc20f82305561a66d34e693561188da/jusatidasigufuzigadageli.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021080501282089860.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/34696999345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=tanita+innerscan+bc+587+manualPDF 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_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B1 20080 bytes
SHA-256: 40081053b0e5f2d89bb8fbe3331ec11fa0fc7ba3d0160eeab0ad7ca325407d29
font_02_sfnt_off00012ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD3 10868 bytes
SHA-256: 439e416cee07d8347857a21d619c7c7168acd3365d781ba24e4dff2fa4de8700

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