Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eae4255c98fd2ed…

MALICIOUS

PDF

87.7 KB Created: 2021-09-11 16:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 55fd01328a58925ef2ba4689ccc66536 SHA-1: 0299c0563d451af8b3ddd476b778b125c779abe4 SHA-256: 5eae4255c98fd2ed483e2dd2da287196cffcb8d884bb6d9a2b6ef34db289d2d8
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads, suggesting an attempt to lure users to malicious sites. The presence of multiple links on potentially compromised or disposable hosting reinforces this phishing or distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b28ed53f49---naxetijuzujipovoxezezo.pdf In PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/g9032il3e4avlpmdv6okg5hm6f/jadezejunesotulopupev.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a899c3b2a6---tupitun.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/dusamomunomujenakigidubex.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137363788dcc---bofulavawimevosaru.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/64653390470.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/43750772078.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021090620354170554.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/bokokudekefelogumujixedu.pdfIn PDF document text
    • http://orem.mn/uploads/files/lidelirakenewezisu.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/vetijo.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/benaxemuvanosa.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134429225cd1---21314430465.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161391f1e294f0---jebevogeno.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/jepazisoponejas.pdfIn PDF document text
    • http://amdind.com/userfiles/file/tufejonomoretogoxaxanetol.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/8744726894.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/60679523515.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613452359c13b---padomiw.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/repepigaronoranebun.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/nudusofiropazuselulapa.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/nolisujagitezezoja.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/pigob.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/47277290833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=find+my+phone+without+internetPDF 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_off0000f030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 10560 bytes
SHA-256: 77de90d272cea823c53c691cdfccd2f6a95d155ef69389f80122e820f0a279f8
font_01_sfnt_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 18652 bytes
SHA-256: 4a63a01471a173afb7ff09ce6dd61da0d7a04d1e70734a1b15e686a7951e95b4
font_02_sfnt_off000138fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1