Malicious PDF — malware analysis report

Static analysis result for SHA-256 1330d43b11e9a74c…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 13:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc7c9e88a343f116fa64fd131f1bff5e SHA-1: d0d6faddec775c9f13ed0eeae79e65cd016601b8 SHA-256: 1330d43b11e9a74c4790c4aaa20c3f06ccbf5061b175a097f7ba2a79cd27cefe
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://ahdjcm.com/upload/files/42964157262.pdf In PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/58388795126.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/makexezitozeruruteminoki.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/zuraxujosalot.pdfIn PDF document text
    • https://digireg.dk/upload/96699655687.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/rekepariguxobivegoxivu.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/3d37b4bcf43371018e5de0e389a10780/57524367760.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210910140004.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/lijen.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/83355191373.pdfIn PDF document text
    • http://obedovice.cz/userfiles/file/xiwudebukowijovu.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/18021572039.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/13172488950.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/11fc229c9dcd588a7176a2efa354f726/27812740056.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/68024089290.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/55512675441.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ai7hbj2gh03la0975002tqhp36/xijewu.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/zidofixig.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/1618331864.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/44833255303.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/vivulowaw.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/37994361445.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613873c38890f---jebexoriwo.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/50506903014.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/78282250053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=lightroom+filter+app+downloadPDF 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_off0000cf5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5D 10820 bytes
SHA-256: 9bbcfd5cc8bdf5b050c303b31fb668d6c30782268b9b62fab747c8366834f790
font_01_sfnt_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 17904 bytes
SHA-256: 26124c530dfaece33b32958b83b61d7bc27805dd8f313ae31be26640c2dccf84