Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3033a560e7faffc…

MALICIOUS

PDF

86.4 KB Created: 2021-09-07 02:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 93c09c981872ff44671ae56af1a1601d SHA-1: c1babe2edc1bf8a3954c235c6ce3fba0f2a44158 SHA-256: d3033a560e7faffcd8d6dd7e8abd5ec041c7b981abd741029d58d581b0fed2d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a link farm heuristic strongly supports a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/73859365872.pdf In PDF document text
    • https://path.mn/userfiles/files/rosiwiwumewovizelewim.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/wulodaxojij.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817bdeb2b14---75566386553.pdfIn PDF document text
    • https://giustofiori.it/file/43612542170.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075fae7a60bb---80338352116.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/76133891329.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/46545505555.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/kc6c5qohaene7stqo44s9g6rlc/loguvara.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/virevaloduv.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/24890785097.pdfIn PDF document text
    • http://www.centralperdana.com/file/35754974071.pdfIn PDF document text
    • http://boratohumculuk.com/ckfinder/userfiles/files/dixatagiwefokefojeril.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/35e74895fc41d933f3f86f96cf35cdb5/10524545587.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/73950252938.pdfIn PDF document text
    • http://sam-global.info/files/file/diguf.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/f1mn6iq4u3vmdacc7q3clihf7q/jogodolubepebotisoradel.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/taluluduxeramumone.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/ffc7c631a04f08873df677ef9639c2de/rixuguvoniwotopux.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/sobulurevebibimuwesafu.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210515015929.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/poeud86iu1lejscf18vp9dho47/53334272827.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/veverik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=braun+age+precision+digital+thermometer+manualPDF 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_off0000ea76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA76 11112 bytes
SHA-256: bbbc8e099949b6b4f94fe05960dc5f2c5438425b6aaee1daf2bee47bbd3cb61e
font_01_sfnt_off000103fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C10 18492 bytes
SHA-256: 85a5407d642fc240a9a28283e5cd13475c07c9bbf43bbe32e9095223534f60d7