Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f0579abf25d78a…

MALICIOUS

PDF

79.1 KB Created: 2021-09-07 18:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6a8a53472444dd8236ae6838c4e568e9 SHA-1: c9df4f7dfd838886601c9d55506db1bddc2ad678 SHA-256: d6f0579abf25d78a58719f850206c43a8da1c5b8a2affc33b0344f75b2c426d8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The presence of embedded URLs and the heuristic firings for compromised CMS uploads and link farms strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://dzstock.com/Upfiles/file/dafodujajetisu.pdf In PDF document text
    • http://4998horo.gmmwireless.com/contents/files/buledevaxukidisawadapis.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4c9vf1u9nv1q62cubeqbhjnrin/21715895227.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/70891022294.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/79699015435.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/nedurumasofafokilufujokis.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875c595ea75---95095691964.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/45731726218.pdfIn PDF document text
    • https://ksuskalology.com/images/file/11151411619.pdfIn PDF document text
    • http://marketingnews.fr/images/file/duxif.pdfIn PDF document text
    • http://actinq.nl/upload/file/86456002317.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/vemetezuk.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/euiv827h7ov7ni46ulq2idh1s1/totoni.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/zisatomorokuduwik.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/35640011130.pdfIn PDF document text
    • http://glassco.ca/clients/9/99/99aa1728c1dafa3cf8773a75727b87c9/File/27111967939.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607479c6374d6---65521132121.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/47748933922.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ec337c95f---4221870846.pdfIn PDF document text
    • https://renetravel.ro/images/files/47956722714.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/fejigonoloxuj.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/95122571134.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd455321075---tezexurubel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=operating+system+notes+for+bca+1st+year+pdfPDF 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_off0000d0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FB 11248 bytes
SHA-256: 54334b8596b5495f3056e80e32e24fd849a1f94e87022570ea26b647ff15a20e
font_01_sfnt_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10320 16864 bytes
SHA-256: 9ebbdc8300b061ee6c0edd9b31577d45331749b2b99803bfecf3e7905ad44c15

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