Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b0833ec02abd64…

MALICIOUS

PDF

86.6 KB Created: 2021-09-02 01:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12452710e500a34ad32cf2df92d7a07e SHA-1: 0ac79c898427b9b18937849e0af9c40d008b73e0 SHA-256: c0b0833ec02abd64a24012d6444894f5d9ad5920fb1fc2a907cd4566b1539c4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple unknown URLs, with one specifically hosted on a compromised WordPress upload directory. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://h1t-urlaurora1-turbo.com/contents//files/34739475137.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vilikekaniw.pdf
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021072611533480554.pdf
    • https://arerp.kr/data/file///69877078004.pdf
    • https://pmcp-avac.com/files/upload-ckfinder/files/puxogotuz.pdf
    • http://nexxstep.nl/userfiles/file/46829236155.pdf
    • http://kirakuramenandsushi.com/uploads/files/kozokimis.pdf
    • https://deniz-sogutma.org/img/userfiles/file/dunivekesazadonolu.pdf
    • http://www.agot.pl/upload/file/fijis.pdf
    • http://masonhn.com/d/files/48265210058.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f89e4481ce5---xabixik.pdf
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/82781574047.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/fd138e7dff1bb02cdfebceae91ea4320/letibodawusigika.pdf
    • https://pacpartner.net/images_client//imagesfile/84748691747.pdf
    • http://owv-sad.de/userfiles/files/92727814080.pdf
    • https://batikatravels.com/userfiles/file/zetiwe.pdf
    • http://burrburroughsfamily.com/clients/55468/File/4573485128.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/0gmgiru4s2hcgvfhpo0irv9031/10442420457.pdf
    • https://szabobuszberles.hu/files/files/99465834174.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b53e51fce---57579079206.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/d528a03026f790bf01c6db5c5294c8c2/bavubewobawe.pdf
    • https://goodluckfishing.com/ckfinder/userfiles/files/vaxigapojoxurasofopiten.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+loss+of+bladder+control
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea4.bin
f6683bf15fb2754fbdbea3d1733b623d51818aec86f3136e61c020ce973c99e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA4 17388 bytes
font_01_sfnt_off00011b80.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B80 16792 bytes
font_02_sfnt_off00013397.bin
80d63a2a3f093befd733206973eaf0dceec696c2d7ea616c3506ae71a0274794
pdf-font-stream PDF embedded font (sfnt) at offset 0x13397 10584 bytes