Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9dcb6a03c7098ed…

MALICIOUS

PDF

74.4 KB Created: 2021-09-16 09:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: d694cbc0f155c7d64644ae4757e76f2b SHA-1: 0f4d13a4aec7cc03fafdd0bda59d8551b73f72b8 SHA-256: a9dcb6a03c7098ed3614f653ca9e0e4789b8242a022ae876c2b39dd71f4266ac
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as link farms on disposable or potentially compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and link farm heuristics suggest the primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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 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://km2804.com/ckupload/files/fivoxadi.pdf In PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336a9fd3d7b---papibujureditij.pdfIn PDF document text
    • http://getdol.com/page_data/file/54585569531.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/wadifelupuze.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/83240409300.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/74315994812.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/rtfa9tfi9hn0j67r3nv1k5au7l/64264367755.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/pisozobefo.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/kimasusagobuwepovele.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/1630518541959.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/73428759440.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/77101766325.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/pemetefibe.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5845d0fd3e39e9ab4aac067f7463f44d/luwovasafefevol.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/5127879815.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/30638269021.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd6556f96e---pibaranegemepofu.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/74502384780.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/20652924965.pdfIn PDF document text
    • http://malifer.hu/upload/file/lotapuvubibo.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/00tl9gembtco5lq8gsnkveutaa/37865071751.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/wupasaj.pdfIn PDF document text
    • http://ktcz.eu/files/files/xuvepopav.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/51564427642.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/29236618987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=350z+gta+5PDF 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_off0000c372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC372 16588 bytes
SHA-256: 5bcf3b3e8eb36b1d3b87a3b17809423ef75cd1cc6e93451d2cad393e95dec774
font_01_sfnt_off0000ee34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE34 9912 bytes
SHA-256: 366229b846f2999303742ca2dc8a8104d7e91b055084f5dd9a8e1a22185f00dd
font_02_sfnt_off00010436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1