Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a96d1e130869c7a…

MALICIOUS

PDF

68.4 KB Created: 2021-09-13 03:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b9ee1efce595d623e2362d70fdb08257 SHA-1: 4e542eaf5dd526ca970ac5948d49642364b5a8fd SHA-256: 9a96d1e130869c7a524a0d1b88ac8629642f3fb7be85a03192166c735492ba69
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting, likely to facilitate malicious downloads. No scripts were extracted, but the overall structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://speedwayinfo.hu/uploads/file/75721556014.pdf In PDF document text
    • https://bagstyle.uz/images/file/lajalotosonivurabidex.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a17cd588db---39563550716.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/semanesirap.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/28729130837.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/81233455781.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/taturar.pdfIn PDF document text
    • http://synowka.pl/galeria/file/61559107472.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/53077452977.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/zobanaviwapesenakiwuw.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe10ad0604---sasojogiralo.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/41535357551.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/02439f9f936cfd01ed5dc936621e10e0/38225459858.pdfIn PDF document text
    • http://fluorescent-training.com/file/10197798979.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/zamirogoku.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/dobudexivozofuvafukawu.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/33562879022.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/54791549080.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/19945678976.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/46324601872.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138aa49b0bef---jizeradefozaziguvorafupe.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/65233789877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=free+downloaders+for+androidPDF 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_off0000b07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07C 10312 bytes
SHA-256: 622f1eb1f88a4bfc7f37bc70684e023dd2055aa8a1941142ab10308dac01936a
font_01_sfnt_off0000c7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D5 14408 bytes
SHA-256: dc2ccb04527b027b42d5d19ff19d2b7017e3251264bca31685e1d2d8d4a6d637
font_02_sfnt_off0000ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1